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These categories represent the four basic missions for which the Department of Homeland Security was established. The technologies which the US uses to succeed in these missions are advanced and varied. <h3>Introduction</a> </h3> <h3><a href="systems_by_agency.htm">Systems by Agency</a> </h3> </td> </tr> <tr> <td valign=center align=center> <font size="+1"> <a href="system_wide.htm">System Wide Technologies <br> <img src="images/barrier.jpg" width="180" height="120"></td></a> </font> </tr> <tr> <td BGCOLOR="#EAE4CA" valign=top> <font size="+1"> <a href="bts.htm">Border and Transportation Security <br> <img height=120 width=180 src="images/btsdogs.jpg"></a> </font> </td> </tr> <tr> <td bgcolor="#FDF8EA" valign=top> <font size="+1"> <a href="epr.htm">Emergency Preparedness and Response <br> <img height=120 width=180 src="images/epr.jpg"></a> </font> </td> </tr><tr> <td BGCOLOR="#EAE4CA" valign=top> <font size="+1"> <a href="cip.htm">Critical Infrastructure Protection <br> <img height=120 width=180 src="images/cip.jpg"></a> </font> </td> </tr> <tr> <td bgcolor="#FDF8EA" valign=top> <font size="+1"> <a href="iasg.htm">Information Analysis, Sharing, and Gathering <br> <img height=120 width=180 src="images/iasg.gif"></a> </font> </td> </tr> </table></center> <style type="text/css"> @media only screen and (min-device-width : 320px) and (max-device-width : 480px) { #ga-ad {display: none;} } </style> <p></p><br><br> <div align=center> <table border="1"> <tr><td> <div align=center> <font size="+1" color="#8C3100"><b>NEWS</b></font><font size="+1" color="#0000C6"><b>LETTER</b></font> </div> </td> </tr> <tr><td bgcolor="#FF0000"> <font face="Arial, Helvetica, sans-serif" color="#FFFFFF" size="+1"><b>Join the GlobalSecurity.org mailing list</b></font> </td></tr> <tr><td> <form name='f1' action='https://inl02.netline.com/rssnews0001/' method='post' target='_blank'> <input type='hidden' name='_submit' value='0001'> <input type='hidden' name='brand' id='brand' value='globalsecurity'> <input type='hidden' name='opt_001' value='Y'> <label for="MERGE0"><strong>Enter Your Email Address</strong></label> <br> <input type='text' id='email' name='email'> <input type='submit' value='Sign Up Now!' id='my_button'> </form> </td></tr> </table> </div> <br> <div class="pubs-container"> <p></p> <br clear=right> <div align="center"> <table> <tr><td> <table> <tr> <td> </td> </tr> </table> </td><td> <table> <tr> <td> </td> </tr> </table> </td></tr> </table> </div> </div> </div>  <div id="clear"> </div> </div> </div> </div> <div id="adbot"> <div class="pubs-container">    </div> <button type="button" data-ot-ccpa-opt-out="button" style="display:none;" class="ot-ccpa-optout__button ot-ccpa-optout__button--light"><img src="https://cookie-cdn.cookiepro.com/ccpa-optout-solution/v1/assets/icon-do-not-sell.svg"style="width:30px;height:30px;" alt="" role="presentation"><span class="ot-ccpa-optout__button__title">Do Not Sell My Personal Information</span></button></div> <div id="navbot"><a href="/org/advertise.htm" title="Advertise with GlobalSecurity.org">Advertise with Us</a> <span class="navsep">|</span> <a href="/org/index.html" title="About GlobalSecurity.org">About Us</a> <span class="navsep">|</span>  <a href="/sitemap.htm" title="GlobalSecurity.org Site Map">Site Map</a> <span class="navsep">|</span> <a href="/privacy.htm" title="GlobalSecurity.org Privacy Policy">Privacy</a></div> <div id="footer"> <a href="https://www.globalsecurity.org/copyright.htm" title="Copyright">Copyright</a> © 2000-2025 GlobalSecurity.org All rights reserved.<br> Site maintained by: <a href="https://www.globalsecurity.org/org/staff/pike.htm" title="John Pike">John Pike</a><br>  <button id="pmLink">Privacy Manager</button>  <script type="text/javascript"> window._qevents = window._qevents || []; (function() { var elem = document.createElement('script'); elem.src = (document.location.protocol == "https:" ? 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