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href="#AEHF-2_(USA-235)"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.2</span> <span>AEHF-2 (USA-235)</span> </div> </a> <ul id="toc-AEHF-2_(USA-235)-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-AEHF-3_(USA-246)" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#AEHF-3_(USA-246)"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.3</span> <span>AEHF-3 (USA-246)</span> </div> </a> <ul id="toc-AEHF-3_(USA-246)-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-AEHF-4_(USA-288)" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#AEHF-4_(USA-288)"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.4</span> <span>AEHF-4 (USA-288)</span> </div> </a> <ul id="toc-AEHF-4_(USA-288)-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-AEHF-5_(USA-292)" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#AEHF-5_(USA-292)"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.5</span> <span>AEHF-5 (USA-292)</span> </div> </a> <ul id="toc-AEHF-5_(USA-292)-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-AEHF-6_(USA-298)" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#AEHF-6_(USA-298)"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.6</span> <span>AEHF-6 (USA-298)</span> </div> </a> <ul id="toc-AEHF-6_(USA-298)-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div 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class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Advanced_Extremely_High_Frequency" title="Advanced Extremely High Frequency – French" lang="fr" hreflang="fr" data-title="Advanced Extremely High Frequency" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Advanced_Extremely_High_Frequency" title="Advanced Extremely High Frequency – Croatian" lang="hr" hreflang="hr" data-title="Advanced Extremely High Frequency" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Advanced_Extremely_High_Frequency" title="Advanced Extremely High Frequency – Italian" lang="it" hreflang="it" data-title="Advanced 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.infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox" style="width:25em;"><caption class="infobox-title">Advanced Extremely High Frequency</caption><tbody><tr><td colspan="2" class="infobox-image"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:AEHF_1.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/18/AEHF_1.jpg/260px-AEHF_1.jpg" decoding="async" width="260" height="185" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/18/AEHF_1.jpg/390px-AEHF_1.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/18/AEHF_1.jpg/520px-AEHF_1.jpg 2x" data-file-width="858" data-file-height="612" /></a></span><div class="infobox-caption">Artist's impression of an AEHF satellite</div></td></tr><tr><td colspan="2" class="infobox-full-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1257001546"></td></tr><tr><th scope="row" class="infobox-label">Manufacturer</th><td class="infobox-data"><a href="/wiki/Lockheed_Martin" title="Lockheed Martin">Lockheed Martin</a><br /><a href="/wiki/Northrop_Grumman" title="Northrop Grumman">Northrop Grumman</a></td></tr><tr><th scope="row" class="infobox-label">Country of origin</th><td class="infobox-data"><a href="/wiki/United_States" title="United States">United States</a></td></tr><tr><th scope="row" class="infobox-label">Operator</th><td class="infobox-data"><a href="/wiki/United_States_Space_Force" title="United States Space Force">United States Space Force</a></td></tr><tr><th scope="row" class="infobox-label">Applications</th><td class="infobox-data"><a href="/wiki/Military_communications" title="Military communications">Military communications</a></td></tr><tr style="display:none"><td colspan="2"> </td></tr><tr><td colspan="2" class="infobox-full-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1257001546"></td></tr><tr><th colspan="2" class="infobox-header">Specifications</th></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Satellite_bus" title="Satellite bus">Bus</a></th><td class="infobox-data"><a href="/wiki/Lockheed_Martin_A2100" title="Lockheed Martin A2100">A2100M</a></td></tr><tr><th scope="row" class="infobox-label">Launch mass</th><td class="infobox-data">6,168 kg (13,598 lb)</td></tr><tr><th scope="row" class="infobox-label">Regime</th><td class="infobox-data"><a href="/wiki/Geosynchronous_orbit" title="Geosynchronous orbit">Geosynchronous orbit</a></td></tr><tr><th scope="row" class="infobox-label">Design life</th><td class="infobox-data">14 years (planned)</td></tr><tr style="display:none"><td colspan="2"> </td></tr><tr><td colspan="2" class="infobox-full-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1257001546"></td></tr><tr><td colspan="2" class="infobox-full-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1257001546"></td></tr><tr><th colspan="2" class="infobox-header">Production</th></tr><tr><th scope="row" class="infobox-label">Status</th><td class="infobox-data">Operational<br />Active</td></tr><tr><th scope="row" class="infobox-label">On order</th><td class="infobox-data">0 <sup id="cite_ref-aehf_ioc_1-0" class="reference"><a href="#cite_note-aehf_ioc-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label">Built</th><td class="infobox-data">6 <sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label">Launched</th><td class="infobox-data">6</td></tr><tr><th scope="row" class="infobox-label">Operational</th><td class="infobox-data">5</td></tr><tr><th scope="row" class="infobox-label">Maiden launch</th><td class="infobox-data">14 August 2010 (<a href="/wiki/USA-214" title="USA-214">USA-214</a>)</td></tr><tr><th scope="row" class="infobox-label">Last launch</th><td class="infobox-data">26 March 2020 (<a href="/wiki/USA-298" title="USA-298">USA-298</a>)</td></tr><tr style="display:none"><td colspan="2"> </td></tr></tbody></table> <p><b>Advanced Extremely High Frequency</b> (<b>AEHF</b>) is a constellation of <a href="/wiki/Communications_satellite" title="Communications satellite">communications satellites</a> operated by the <a href="/wiki/United_States_Space_Force" title="United States Space Force">United States Space Force</a>. They are used to relay secure communications for the <a href="/wiki/United_States_Armed_Forces" title="United States Armed Forces">United States Armed Forces</a>, the <a href="/wiki/British_Armed_Forces" title="British Armed Forces">British Armed Forces</a>, the <a href="/wiki/Canadian_Armed_Forces" title="Canadian Armed Forces">Canadian Armed Forces</a>, the <a href="/wiki/Netherlands_Armed_Forces" title="Netherlands Armed Forces">Netherlands Armed Forces</a> and the <a href="/wiki/Australian_Defence_Force" title="Australian Defence Force">Australian Defence Force</a>.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> The system consists of six satellites in <a href="/wiki/Geostationary_orbit" title="Geostationary orbit">geostationary orbits</a>. The final satellite was launched on 26 March 2020. AEHF is backward compatible with, and replaces, the older <a href="/wiki/Milstar" title="Milstar">Milstar</a> system and will operate at 44 <a href="/wiki/Hertz" title="Hertz">GHz</a> uplink (<a href="/wiki/Extremely_high_frequency" title="Extremely high frequency">extremely high frequency</a> (EHF) band) and 20 GHz downlink (<a href="/wiki/Super_high_frequency" title="Super high frequency">super high frequency</a> (SHF) band).<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> The AEHF system is a joint service communications system that provides survivable, global, secure, protected, and jam-resistant communications for high-priority military ground, sea and air assets. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Overview">Overview</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=1" title="Edit section: Overview"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>AEHF satellites use many narrow spot beams directed towards the <a href="/wiki/Earth" title="Earth">Earth</a> to relay communications to and from users. Crosslinks between the satellites allow them to relay communications directly rather than via a <a href="/wiki/Ground_station" title="Ground station">ground station</a>. The satellites are designed to provide jam-resistant communications with a low probability of interception. They incorporate <a href="/wiki/Frequency-hopping_spread_spectrum" title="Frequency-hopping spread spectrum">frequency-hopping</a> radio technology, as well as <a href="/wiki/Phased_array" title="Phased array">phased array</a> antennas that can adapt their <a href="/wiki/Radiation_pattern" title="Radiation pattern">radiation patterns</a> in order to block out potential sources of <a href="/wiki/Radio_jamming" title="Radio jamming">jamming</a>. </p><p>AEHF incorporates the existing Milstar low data-rate and medium data-rate signals, providing 75–2400 <a href="/wiki/Bit_rate" title="Bit rate">bit/s</a> and 4.8 kbit/s–1.544 Mbit/s respectively. It also incorporates a new signal, allowing data rates of up to 8.192 Mbit/s.<sup id="cite_ref-ng2009_5-0" class="reference"><a href="#cite_note-ng2009-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> When complete, the space segment of the AEHF system will consist of six satellites, which provides coverage of the surface of the Earth between <a href="/wiki/Latitude" title="Latitude">latitudes</a> of 65° north and 65° south.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> For northern polar regions, the Enhanced Polar System acts as an adjunct to AEHF to provide EHF coverage.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p><p>The initial contract for the design and development of the AEHF satellites was awarded to <a href="/wiki/Lockheed_Martin" title="Lockheed Martin">Lockheed Martin Space Systems</a> and <a href="/wiki/Northrop_Grumman" title="Northrop Grumman">Northrop Grumman Space Technology</a> in November 2001, and covered the System Development and Demonstration phase of the program. The contract covered the construction and launch <sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> of three satellites, and the construction of a mission control segment. The contract was managed by the MILSATCOM Program Office of the <a href="/wiki/Space_and_Missile_Systems_Center" class="mw-redirect" title="Space and Missile Systems Center">Space and Missile Systems Center</a>. Like the Milstar system, AEHF are operated by the <a href="/wiki/4th_Space_Operations_Squadron" title="4th Space Operations Squadron">4th Space Operations Squadron</a>, located at <a href="/wiki/Schriever_Space_Force_Base" title="Schriever Space Force Base">Schriever Space Force Base</a> and the <a href="/wiki/148th_Space_Operations_Squadron" title="148th Space Operations Squadron">148th Space Operations Squadron</a> at <a href="/wiki/Vandenberg_SFB" class="mw-redirect" title="Vandenberg SFB">Vandenberg SFB</a>. </p><p>It extends the "cross-links" among AEHF of earlier Milstar satellites, which makes it much less vulnerable to attacks on ground stations. As a geosynchronous satellite over the <a href="/wiki/Equator" title="Equator">equator</a>, it still needs to be supplemented with additional systems optimized for polar coverage in high latitudes. </p><p>In the April 2009 Defense Department budget request, Secretary of Defense <a href="/wiki/Robert_Gates" title="Robert Gates">Robert Gates</a> said he planned to cancel the <a href="/wiki/Transformational_Satellite_Communications_System" title="Transformational Satellite Communications System">Transformational Satellite Communications System</a>, still in the design phase, in favor of additional AEHF capacity. Individual AEHF satellites, exclusive of launch expenses, cost US$850 million. </p> <div class="mw-heading mw-heading2"><h2 id="Bands">Bands</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=2" title="Edit section: Bands"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Prior to the AEHF, United States and allied military satellite communications systems fell into one of three categories:<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p> <ul><li>Wideband: maximum bandwidth among fixed and semifixed earth stations</li> <li>Protected: survivable against <a href="/wiki/Electronic_warfare" title="Electronic warfare">electronic warfare</a> and other attacks, even if bandwidth is sacrificed</li> <li>Narrowband: principally for tactical use, sacrificing bandwidth for simplicity, reliability, and light weight of terrestrial equipment</li></ul> <p>AEHF, however, converges the role of its wideband <a href="/wiki/Defense_Satellite_Communications_System" title="Defense Satellite Communications System">Defense Satellite Communications System</a> (DSCS) and protected <a href="/wiki/MILSTAR" class="mw-redirect" title="MILSTAR">MILSTAR</a> predecessors, while increasing bandwidth over both. There will still need to be specialized satellite communications for extremely high data rate space sensors, such as <a href="/wiki/Geospatial_intelligence" title="Geospatial intelligence">geospatial</a> and <a href="/wiki/Signals_intelligence" title="Signals intelligence">signals intelligence</a> satellites, but their downlinked data will typically go to a specialized receiver and be processed into smaller amounts; the processed data will flow through AEHF. </p> <div class="mw-heading mw-heading2"><h2 id="Launch_and_positioning">Launch and positioning</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=3" title="Edit section: Launch and positioning"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>AEHF satellites are sent into space using an <a href="/wiki/National_Security_Space_Launch" title="National Security Space Launch">Evolved Expendable Launch Vehicle</a> (EELV). The payload weight at launch is approximately 9,000 kg (20,000 lb); by the time it expends propellants to achieve proper orbit, its weight is approximately 6,168 kg (13,598 lb). The satellites will operate in <a href="/wiki/Geosynchronous_orbit" title="Geosynchronous orbit">geosynchronous orbit</a> (GEO) orbit; it takes over 100 days for the orbital adjustments to reach its stable geo-position after launch. </p> <div class="mw-heading mw-heading2"><h2 id="Electronics">Electronics</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=4" title="Edit section: Electronics"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/Uplink" class="mw-redirect" title="Uplink">Uplinks</a> and crosslinks are in the <a href="/wiki/Extremely_high_frequency" title="Extremely high frequency">extremely high frequency</a> (EHF) while the <a href="/wiki/Satellite_downlink" class="mw-redirect" title="Satellite downlink">downlinks</a> use the <a href="/wiki/Super_high_frequency" title="Super high frequency">super high frequency</a> (SHF). The variety of frequencies used, as well as the desire to have tightly focused downlinks for security, require a range of antennas, seen in the picture: </p> <ul><li>2 SHF downlink phased arrays</li> <li>2 satellite-to-satellite crosslinks</li> <li>2 uplink/downlink <a href="/wiki/Null_(radio)#Nulling_antenna" title="Null (radio)">nulling antennas</a></li> <li>1 uplink EHF phased array</li> <li>6 uplink/downlink <a href="/wiki/Gimbal" title="Gimbal">gimbaled</a> dish antenna</li> <li>1 uplink/downlink Earth coverage horns</li></ul> <p>Phased array technology is new in communications satellites, but increases reliability by removing the mechanical movement required for gimbaled, motor-driven antennas. </p><p>The low gain Earth coverage antennas send information anywhere in a third of the Earth covered by each satellite's footprint. Phased array antennas provide super high-gain earth coverages, enabling worldwide unscheduled access for all users, including small portable terminals and submarines. The six medium resolution coverage antennas (MRCA), are highly directional "spot" coverage; they can be time-shared to cover up to 24 targets. The two high-resolution coverage area antennas enable operations in the presence of in-beam jamming; the nulling antennas are part of the <a href="/w/index.php?title=Electronic_defense&action=edit&redlink=1" class="new" title="Electronic defense (page does not exist)">electronic defense</a> that helps discriminate true signals from electronic attack.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p><p>Another change from existing satellites is using solid-state transmitters rather than the <a href="/wiki/Traveling_wave_tube" class="mw-redirect" title="Traveling wave tube">traveling wave tubes</a> used in most high-power military SHF/EHF applications. TWTs have a fixed power output; the newer devices allow varying the transmitted power, both for lowering the probability of intercept and for overall power efficiency.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (April 2024)">citation needed</span></a></i>]</sup> </p><p>The payload flight software contains approximately 500,000 lines of real-time, distributed, embedded code executing simultaneously on 25 on-board processors.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Services">Services</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=5" title="Edit section: Services"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>AEHF provides individual digital data streams from rates of 75 bits/second to 8 Megabits/second.<sup id="cite_ref-ng2009_5-1" class="reference"><a href="#cite_note-ng2009-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> These include and go beyond MILSTAR's low data rate (LDR) and medium data rate (MDR) as well as the actually fairly slow high data rate (HDR) for submarines. The faster links are designated extended data rates (XDR). </p><p>While there are a number of ground terminals, the airborne terminal has been part of the <a href="/w/index.php?title=Family_of_Advanced_Beyond_Line-of-Sight-Terminal&action=edit&redlink=1" class="new" title="Family of Advanced Beyond Line-of-Sight-Terminal (page does not exist)">Family of Advanced Beyond Line-of-Sight-Terminal</a> (FAB-T) project. Other ground stations include the <b>Single-Channel Antijam Man-Portable Terminal</b> (SCAMP), <i>Secure Mobile Anti-jam Reliable Tactical Terminal</i> (<a href="/wiki/SMART-T" title="SMART-T">SMART-T</a>), and <b>Submarine High Data Rate</b> (Sub HDR) system. </p><p>With Boeing as the prime contractor and <a href="/wiki/L-3_Communications" class="mw-redirect" title="L-3 Communications">L-3 Communications</a> and <a href="/wiki/Rockwell_Collins" title="Rockwell Collins">Rockwell Collins</a> as major subcontractors, the first FAB-T (Increment 1) was delivered, for use on the <a href="/wiki/B-2_Spirit" class="mw-redirect" title="B-2 Spirit">B-2 Spirit</a> aircraft, in February 2009. It is planned for other aircraft including the B-52, RC-135, E-4, and E-6 aircraft. Other installations will go into fixed and transportable command posts. It successfully interoperated with legacy communications using a command post terminal and the Army Single Channel Anti-jam Man Portable Terminal,<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Satellites">Satellites</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=6" title="Edit section: Satellites"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="AEHF-1_(USA-214)"><span id="AEHF-1_.28USA-214.29"></span>AEHF-1 (USA-214)</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=7" title="Edit section: AEHF-1 (USA-214)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/USA-214" title="USA-214">USA-214</a></div> <p>The first satellite, USA-214, was successfully launched by an <a href="/wiki/Atlas_V" title="Atlas V">Atlas V</a> 531 launch vehicle on 14 August 2010, from <a href="/wiki/Cape_Canaveral_Space_Launch_Complex_41" title="Cape Canaveral Space Launch Complex 41">Space Launch Complex 41</a> at the <a href="/wiki/Cape_Canaveral_Space_Force_Station" title="Cape Canaveral Space Force Station">Cape Canaveral Air Force Station</a> (CCAFS). This occurred four years behind schedule; when the contract was awarded in 2000 the first launch was expected to have taken place in 2006.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> The program was restructured in October 2004, when the <a href="/wiki/National_Security_Agency" title="National Security Agency">National Security Agency</a> (NSA) did not deliver key cryptographic equipment to the payload contractor in time to meet the launch schedule.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Successful_launch">Successful launch</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=8" title="Edit section: Successful launch"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The <a href="/wiki/Atlas_V" title="Atlas V">Atlas V</a> <a href="/wiki/Launch_vehicle" title="Launch vehicle">launch vehicle</a> successfully placed the satellite into a supersynchronous-apogee <a href="/wiki/Geostationary_transfer_orbit" title="Geostationary transfer orbit">transfer orbit</a> with a <a href="/wiki/Apsis" title="Apsis">perigee</a> of 275 km, an <a href="/wiki/Apsis" title="Apsis">apogee</a> of 50,000 km, an <a href="/wiki/Orbital_inclination" title="Orbital inclination">inclination</a> of 22.1°.<sup id="cite_ref-Ray2011_16-0" class="reference"><a href="#cite_note-Ray2011-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Failure_of_the_kick_motor,_and_recovery_using_the_Hall-effect_thrusters"><span id="Failure_of_the_kick_motor.2C_and_recovery_using_the_Hall-effect_thrusters"></span>Failure of the kick motor, and recovery using the Hall-effect thrusters</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=9" title="Edit section: Failure of the kick motor, and recovery using the Hall-effect thrusters"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The satellite vehicle's <a href="/wiki/Liquid_apogee_engine" title="Liquid apogee engine">liquid apogee engine</a> (LAE) provided by IHI failed to raise the orbit after two attempts.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> To solve the problem, the perigee altitude was raised to 4700 km with twelve firings of the smaller <a href="/wiki/Aerojet_Rocketdyne" title="Aerojet Rocketdyne">Aerojet Rocketdyne</a>-provided Reaction Engine Assembly thrusters, originally intended for <a href="/wiki/Spacecraft_attitude_control" title="Spacecraft attitude control">attitude control</a> during the LAE engine burns.<sup id="cite_ref-Ray2011_16-1" class="reference"><a href="#cite_note-Ray2011-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> From this altitude, the <a href="/wiki/Solar_panels_on_spacecraft" title="Solar panels on spacecraft">solar panels</a> were deployed and the orbit was raised toward the operational orbit over the course of nine months using the 0.27 Newton <a href="/wiki/Hall-effect_thruster" title="Hall-effect thruster">Hall thrusters</a>, also provided by Aerojet Rocketdyne, a form of <a href="/wiki/Electrically_powered_spacecraft_propulsion" class="mw-redirect" title="Electrically powered spacecraft propulsion">electric propulsion</a> which is highly efficient, but low thrust. This took much longer than initially intended due to the lower starting altitude for the HCT maneuvers. This led to program delays, as the second and third satellite vehicle LAEs were analyzed. </p><p>A <a href="/wiki/Government_Accountability_Office" title="Government Accountability Office">Government Accountability Office</a> (GAO) report released in July 2011 stated that the blocked fuel line in the liquid apogee engine was most likely caused by a piece of cloth inadvertently left in the line during the manufacturing process.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> While this is believed to have been the primary cause of the failure, a <a href="/wiki/United_States_Department_of_Defense" title="United States Department of Defense">U.S. Department of Defense</a> Selected Acquisition Report adds that fuel loading procedures and unmet thermal control requirements could also have contributed.<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> The remaining satellites were declared flight-ready a month prior to the release of the GAO report.<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="AEHF-2_(USA-235)"><span id="AEHF-2_.28USA-235.29"></span>AEHF-2 (USA-235)</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=10" title="Edit section: AEHF-2 (USA-235)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Like the first AEHF satellite, the second (AEHF-2) was launched on an Atlas V flying in the 531 configuration. The launch from Space Launch Complex 41 at Cape Canaveral took place on 4 May 2012.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> After three months of maneuvering, it reached its proper position and the testing procedures were started. Completion of checkout of AEHF-2 was announced on 14 November 2012 and control turned over to the 14th Air Force for operations for an expected 14-year service life through 2026.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="AEHF-3_(USA-246)"><span id="AEHF-3_.28USA-246.29"></span>AEHF-3 (USA-246)</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=11" title="Edit section: AEHF-3 (USA-246)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The third AEHF satellite was launched from Cape Canaveral on 18 September 2013 at 08:10 UTC.<sup id="cite_ref-ft20130918_23-0" class="reference"><a href="#cite_note-ft20130918-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> The two-hour window to launch the satellite opened at 07:04 UTC <sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> and the launch occurred as soon as weather-related clouds and high-altitude winds cleared sufficiently to meet the launch criteria.<sup id="cite_ref-ft20130918_23-1" class="reference"><a href="#cite_note-ft20130918-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="AEHF-4_(USA-288)"><span id="AEHF-4_.28USA-288.29"></span>AEHF-4 (USA-288)</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=12" title="Edit section: AEHF-4 (USA-288)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The fourth AEHF satellite was launched on 17 October 2018 from Cape Canaveral at 04:15 UTC using an Atlas V 551 rocket operated by the United Launch Alliance (ULA).<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="AEHF-5_(USA-292)"><span id="AEHF-5_.28USA-292.29"></span>AEHF-5 (USA-292)</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=13" title="Edit section: AEHF-5 (USA-292)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The fifth AEHF satellite was launched on 8 August 2019 from Cape Canaveral at 10:13 UTC using an Atlas V 551 rocket.<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> A secondary payload named TDO-1 accompanied the AEHF-5 satellite into orbit.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="AEHF-6_(USA-298)"><span id="AEHF-6_.28USA-298.29"></span>AEHF-6 (USA-298)</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=14" title="Edit section: AEHF-6 (USA-298)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The sixth AEHF satellite was launched on 26 March 2020 at 20:18 UTC by an Atlas V 551 from <a href="/wiki/Cape_Canaveral_Space_Force_Station" title="Cape Canaveral Space Force Station">Cape Canaveral Space Force Station</a> (CCSFS), <a href="/wiki/Cape_Canaveral_Space_Launch_Complex_41" title="Cape Canaveral Space Launch Complex 41">SLC-41</a>. It was the first launch of a <a href="/wiki/United_States_Space_Force" title="United States Space Force">U.S. Space Force</a> mission since the establishment of the new military service.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-aehf6-ie_31-0" class="reference"><a href="#cite_note-aehf6-ie-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=15" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1259569809">.mw-parser-output .portalbox{padding:0;margin:0.5em 0;display:table;box-sizing:border-box;max-width:175px;list-style:none}.mw-parser-output .portalborder{border:1px solid var(--border-color-base,#a2a9b1);padding:0.1em;background:var(--background-color-neutral-subtle,#f8f9fa)}.mw-parser-output .portalbox-entry{display:table-row;font-size:85%;line-height:110%;height:1.9em;font-style:italic;font-weight:bold}.mw-parser-output .portalbox-image{display:table-cell;padding:0.2em;vertical-align:middle;text-align:center}.mw-parser-output .portalbox-link{display:table-cell;padding:0.2em 0.2em 0.2em 0.3em;vertical-align:middle}@media(min-width:720px){.mw-parser-output .portalleft{clear:left;float:left;margin:0.5em 1em 0.5em 0}.mw-parser-output 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system (WGS)</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=16" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output 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0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.losangeles.af.mil/News/Article-Display/Article/734675/aehf-achieves-initial-operational-capability/">"AEHF Achieves Initial Operational Capability"</a>. Los Angeles Air Force Base. 30 July 2015<span class="reference-accessdate">. Retrieved <span class="nowrap">4 January</span> 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=AEHF+Achieves+Initial+Operational+Capability&rft.pub=Los+Angeles+Air+Force+Base&rft.date=2015-07-30&rft_id=http%3A%2F%2Fwww.losangeles.af.mil%2FNews%2FArticle-Display%2FArticle%2F734675%2Faehf-achieves-initial-operational-capability%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Extremely+High+Frequency" class="Z3988"></span> <span class="noviewer" typeof="mw:File"><span><img alt="Public Domain" src="//upload.wikimedia.org/wikipedia/en/thumb/6/62/PD-icon.svg/12px-PD-icon.svg.png" decoding="async" width="12" height="12" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/6/62/PD-icon.svg/18px-PD-icon.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/6/62/PD-icon.svg/24px-PD-icon.svg.png 2x" data-file-width="196" data-file-height="196" /></span></span> This article incorporates text from this source, which is in the <a href="/wiki/Public_domain" title="Public domain">public domain</a>.</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://spaceflightnow.com/2017/08/02/two-u-s-military-satellite-launches-delayed-into-next-year/">"Two U.S. military satellite launches delayed into next year"</a>. Spaceflight Now. 2 August 2017<span class="reference-accessdate">. Retrieved <span class="nowrap">4 January</span> 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Two+U.S.+military+satellite+launches+delayed+into+next+year&rft.pub=Spaceflight+Now&rft.date=2017-08-02&rft_id=https%3A%2F%2Fspaceflightnow.com%2F2017%2F08%2F02%2Ftwo-u-s-military-satellite-launches-delayed-into-next-year%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Extremely+High+Frequency" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.losangeles.af.mil/News/Article-Display/Article/1927224/aehf-5-ready-for-launch/">"AEHF-5 Ready for Launch"</a>. Los Angeles Air Force Base<span class="reference-accessdate">. Retrieved <span class="nowrap">12 August</span> 2019</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=AEHF-5+Ready+for+Launch&rft.pub=Los+Angeles+Air+Force+Base&rft_id=https%3A%2F%2Fwww.losangeles.af.mil%2FNews%2FArticle-Display%2FArticle%2F1927224%2Faehf-5-ready-for-launch%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Extremely+High+Frequency" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://pdf.directindustry.com/pdf/northrop-grumman-synoptics/advanced-ehf-payloads-aehf/33187-138364-_2.html">"Northrop Grumman AEHF"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">15 June</span> 2011</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Northrop+Grumman+AEHF&rft_id=https%3A%2F%2Fpdf.directindustry.com%2Fpdf%2Fnorthrop-grumman-synoptics%2Fadvanced-ehf-payloads-aehf%2F33187-138364-_2.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Extremely+High+Frequency" class="Z3988"></span></span> </li> <li id="cite_note-ng2009-5"><span class="mw-cite-backlink">^ <a href="#cite_ref-ng2009_5-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-ng2009_5-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20100323043010/http://www.as.northropgrumman.com/products/aehf/index.html">"Advanced EHF Payloads (AEHF)"</a>. Northrop Grumman. Archived from <a rel="nofollow" class="external text" href="http://www.as.northropgrumman.com/products/aehf/">the original</a> on 23 March 2010<span class="reference-accessdate">. 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Interesting Engineering<span class="reference-accessdate">. Retrieved <span class="nowrap">28 April</span> 2020</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=For+the+First+Time%2C+US+Space+Force+Is+Launching+to+Orbit+on+Atlas+5+Rocket&rft.date=2020-03-26&rft.au=Brad+Bergan&rft_id=https%3A%2F%2Finterestingengineering.com%2Ffor-the-first-time-us-space-force-is-launching-to-orbit-on-atlas-5-rocket&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Extremely+High+Frequency" class="Z3988"></span></span> </li> </ol></div></div> <p><i>As of <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Advanced_Extremely_High_Frequency&oldid=767201874">this edit</a>, this article uses content from </i><a rel="nofollow" class="external text" href="http://en.citizendium.org/wiki/Advanced_Extremely_High_Frequency_(satellite)">"Advanced Extremely High Frequency (satellite)"</a><i>, which is licensed in a way that permits reuse under the <a href="/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License" class="mw-redirect" title="Wikipedia:Text of Creative Commons Attribution-ShareAlike 3.0 Unported License">Creative Commons Attribution-ShareAlike 3.0 Unported License</a>, but not under the <a href="/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License" title="Wikipedia:Text of the GNU Free Documentation License">GFDL</a>. All relevant terms must be followed.</i> </p> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Extremely_High_Frequency&action=edit&section=17" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://nasatech.net/nasatechAEHF1.html">AEHF-1 Launch, SLC-41, CCAFS, 14 August 2010 @ 7:07 am EDT</a><sup class="noprint Inline-Template"><span style="white-space: nowrap;">[<i><a href="/wiki/Wikipedia:Link_rot" title="Wikipedia:Link rot"><span title=" Dead link tagged August 2023">permanent dead link</span></a></i><span style="visibility:hidden; color:transparent; padding-left:2px">‍</span>]</span></sup></li> <li><a rel="nofollow" class="external text" href="http://nasatech.net/ntAEHF-2_PAGE.html">AEHF-2 Launch, SLC-41, CCAFS, 04 May 2012 @ 2:42 pm EDT</a><sup class="noprint Inline-Template"><span style="white-space: nowrap;">[<i><a href="/wiki/Wikipedia:Link_rot" title="Wikipedia:Link rot"><span title=" Dead link tagged August 2023">permanent dead link</span></a></i><span style="visibility:hidden; color:transparent; padding-left:2px">‍</span>]</span></sup></li> <li><a rel="nofollow" class="external text" href="http://nasatech.net/ntAEHF-3_PAGE.html">AEHF-3 Launch, SLC-41, CCAFS, 18 September 2013 @ 4:10 am EDT</a><sup class="noprint Inline-Template"><span style="white-space: nowrap;">[<i><a href="/wiki/Wikipedia:Link_rot" title="Wikipedia:Link rot"><span title=" Dead link tagged August 2023">permanent dead link</span></a></i><span style="visibility:hidden; color:transparent; padding-left:2px">‍</span>]</span></sup></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist 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style="color:inherit">v</abbr></a></li><li class="nv-talk"><a href="/w/index.php?title=Template_talk:USAF/USSF_space_vehicles&action=edit&redlink=1" class="new" title="Template talk:USAF/USSF space vehicles (page does not exist)"><abbr title="Discuss this template" style="color:inherit">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:USAF/USSF_space_vehicles" title="Special:EditPage/Template:USAF/USSF space vehicles"><abbr title="Edit this template" style="color:inherit">e</abbr></a></li></ul></div><div id="USAF_and_USSF_space_vehicle_designations_(since_1962)" style="font-size:114%;margin:0 4em"><a href="/wiki/United_States_Air_Force" title="United States Air Force">USAF</a> and <a href="/wiki/United_States_Space_Force" title="United States Space Force">USSF</a> space vehicle designations (since 1962)</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%;background-color:#DCDCDC;color:inherit;">SLV series</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Scout_(rocket_family)" title="Scout (rocket family)">SLV-1 (Scout)</a></li> <li><a href="/wiki/Thor_(rocket_family)" title="Thor (rocket family)">SLV-2 (Thor)</a></li> <li><a href="/wiki/Atlas_(rocket_family)" title="Atlas (rocket family)">SLV-3 (Atlas)</a></li> <li><a href="/wiki/Titan_II_GLV" title="Titan II GLV">SLV-4 (Titan II)</a></li> <li><a href="/wiki/Titan_(rocket_family)" title="Titan (rocket family)">SLV-5 (Titan)</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;background-color:#DCDCDC;color:inherit;">SB series</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/SM-65E_Atlas" title="SM-65E Atlas">SB-1</a></li> <li><a href="/wiki/Atlas_II" title="Atlas II">SB-2</a></li> <li><a href="/wiki/Delta_II" title="Delta II">SB-3</a></li> <li><a href="/wiki/Titan_23G" title="Titan 23G">SB-4</a></li> <li><a href="/wiki/Titan_IV" title="Titan IV">SB-5</a></li> <li><a href="/wiki/Titan_34D" title="Titan 34D">SB-6</a></li> <li><a href="/wiki/Inertial_Upper_Stage" title="Inertial Upper Stage">SSB-7</a></li> <li><a href="/wiki/Centaur_(rocket_stage)" title="Centaur (rocket stage)">SSB-8</a></li> <li><a href="/wiki/Payload_Assist_Module" title="Payload Assist Module">SSB-9</a></li> <li><a href="/wiki/Transtage" title="Transtage">SSB-10</a></li> <li><a href="/wiki/Pegasus_(rocket)" class="mw-redirect" title="Pegasus (rocket)">ASB-11</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;background-color:#DCDCDC;color:inherit;">Satellites</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Defense_Meteorological_Satellite_Program" title="Defense Meteorological Satellite Program">WS-1</a></li> <li><a href="/wiki/Defense_Meteorological_Satellite_Program" title="Defense Meteorological Satellite Program">WS-2</a></li> <li><a href="/w/index.php?title=IMEWS&action=edit&redlink=1" class="new" title="IMEWS (page does not exist)">LS-3</a></li> <li><a href="/wiki/Defense_Satellite_Communications_System" title="Defense Satellite Communications System">ES-4</a></li> <li><a href="/wiki/Defense_Satellite_Communications_System" title="Defense Satellite Communications System">ES-5</a></li> <li><a href="/w/index.php?title=Boost_Surveillance_Tracking_System&action=edit&redlink=1" class="new" title="Boost Surveillance Tracking System (page does not exist)">LS-6</a></li> <li><a href="/wiki/Global_Positioning_System" title="Global Positioning System">NS-7</a></li> <li><a href="/wiki/Milstar" title="Milstar">ES-8</a></li> <li><a href="/wiki/Space_Surveillance_and_Tracking_System" class="mw-redirect" title="Space Surveillance and Tracking System">LS-9</a></li> <li><a href="/w/index.php?title=Space-Based_Radar_(USAF)&action=edit&redlink=1" class="new" title="Space-Based Radar (USAF) (page does not exist)">LS-10</a> (I)</li> <li><a href="/wiki/XSS-10" title="XSS-10">XSS-10</a> (II)</li> <li><a href="/wiki/USA-165" title="USA-165">XSS-11</a><sup><small>2</small></sup></li> <li><a href="/w/index.php?title=XSS-12&action=edit&redlink=1" class="new" title="XSS-12 (page does not exist)">XSS-12</a></li> <li><span class="tmp-color" style="color:grey">S-13</span><sup><small>1</small></sup></li> <li><a href="/wiki/Wideband_Global_SATCOM" title="Wideband Global SATCOM">ES-14</a></li> <li><a href="/wiki/Space_Based_Space_Surveillance" title="Space Based Space Surveillance">LS-15</a><sup><small>3</small></sup></li> <li><a href="/wiki/Space-Based_Infrared_System" title="Space-Based Infrared System">LS-16</a><sup><small>3</small></sup></li> <li><a class="mw-selflink selflink">ES-17</a></li> <li><a href="/wiki/GOES_13" title="GOES 13">EWS-G1</a></li> <li><a href="/wiki/GOES_15" title="GOES 15">EWS-G2</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2" style="background-color:#DCDCDC;color:inherit;"><div> <ul><li><sup>1</sup> Not assigned</li> <li><sup>2</sup> Unofficial designation</li> <li><sup>3</sup> Designation believed to be this type but unconfirmed</li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Advanced_Extremely_High_Frequency&oldid=1243823686">https://en.wikipedia.org/w/index.php?title=Advanced_Extremely_High_Frequency&oldid=1243823686</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" 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