Press release: “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.
The documents posted today, obtained through the Freedom of Information Act and archival research, include documents on the theoretical work behind the concept of space-based missile detection, the early doubts about the feasibility of such detection, and 1960s research and development work on the Missile Defense Alarm System (MIDAS). They also include documents on the evolution of the DSP–with regard both to its capabilities and its use for a variety of additional missions, including the detection of intermediate-range missiles, bombers flying on afterburner and spacecraft. In addition, a number of documents focus on the decades-long search for a follow-on system to DSP.
Compiled by National Security Archive Senior Fellow Dr. Jeffrey T. Richelson, the documents in the briefing book originated with the Defense Department, Air Force, U.S. Space Command, Air Force Space Command, Air Force Space and Missile Systems Center, Aerospace Corporation, Government Accounting Office, and other organizations.”