Ballistic Missile Early Warning System
The RCA 474L Ballistic Missile Early Warning System was a United States Air Force Cold War early warning radar, computer, and communications system, for ballistic missile detection. The network of twelve radars, which was constructed beginning in 1958 and became operational in 1961, was built to detect a mass ballistic missile attack launched on northern approaches [for] 15 to 25 minutes' warning time also provided Project Space Track satellite data.
Three of the huge AN/FPS-50 radars, BMEWS Site 2, near Anderson, Alaska, in 1962.
BMEWS tracking monitors in the Thule Tactical Operations Room, which were upgraded in 1987.
4 AN/FPS-50 detection reflectors at Thule Site J. The concrete foundation included a large refrigeration system to prevent the curing concrete's heat from melting the permafrost.
Fylingdales AN/FPS-49 radomes in 1986
Project Space Track was a research and development project of the US Air Force, to create a tracking system for all artificial satellites of the Earth and space probes, domestic and foreign.
The Baker-Nunn satellite tracking camera.