Radar coverage provided by some <a href="https://en.wikipedia.org/wiki/PAVE_PAWS" class="extiw" title="en:PAVE PAWS">PAVE PAWS</a> (blue) and <a href="https://en.wikipedia.org/wiki/BMEWS" class="extiw" title="en:BMEWS">BMEWS</a> (red) installations.
Los688
Adapted in part from page 16 of <a rel="nofollow" class="external text" href="https://web.archive.org/web/20090109075417/http://www.mda.mil/mdalink/pdf/too164.pdf">http://www.mda.mil/mdalink/pdf/too164.pdf</a>