sentences:  The 780th Aircraft Control and Warning Squadron (AC&W Sq) began operations using AN/FPS-3 search and AN/FPS-4 height-finder radars, 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.During 1957 an AN/GPS-3 search radar made a brief appearance.