Schriever Air Force Base
Schriever AFB is home to the 50th Space Wing that controls warning, navigational, and communications satellites. It is the location of the global positioning system (GPS) master control station and GPS Operations Center and the US Naval Observatory Alternate Master Clock used to synchronize GPS satellite time. Schriever is also developing parts of national missile defense and runs parts of the annual wargames used by the nations military.
(Source: Wikipedia.org)
