How do we get the Chinese to put GPS locators on their warplanes so we can track them? Same with smugglers...
DOD radar is looking for threats.
For that matter, how does GPS allow us to forcast tornadoes?
LOL, you have no ideal on earh where our defense radar systems are, maybe you should stick with something you know about. http://en.m.wikipedia.org/wiki/Geostationary_orbit