Space-Based Early Warning: From MIDAS to DSP to SBIRS
Washington D.C., November 9, 2007 - In anticipation of the planned launch of the final Defense Support Program (DSP) satellite tomorrow evening, which was originally scheduled to be orbited in October 2005, the National Security Archive has posted on the Web a collection of declassified documents tracing the history of the program from its roots as Subsystem G of WS-117L in 1957. At that time the U.S. began seriously planning to deploy satellites that would detect the infrared signals emitted by intercontinental ballistic missiles in order to provide warning of a Soviet missile attack.