The 635th Radar Squadron, which used the AN/CPS-5 to perform its mission, joined the Semi Automatic Ground Environment system in 1960.
It joined the Semi Automatic Ground Environment (SAGE) system and was redesignated as a Radar Squadron in 1960. The squadron was first activated as an Aircraft Control and Warning Squadron (AC&W Sq) in 1947 at McChord Field, WA with a mission to detect and warn of aircraft and defend an area to the west of the Cascade Mountains. Its main search radar to perform this mission at this time was the AN/CPS-5. 
