 The squadron was reassigned to the 29th Air Division on 16 February 1953, and Rapid City AFB was re-designated Ellsworth AFB.The 740th AC&W Squadron began operations in 1955 with AN/MPS-7 search radar, and initially the station functioned as a Ground-Control Intercept (GCI) and warning station.As a GCI station, the squadron's role was to guide interceptor aircraft toward unidentified intruders picked up on the unit's radar scopes.