646th Radar Squadron
The 646th Aircraft Control and Warning Squadron was the operational USAF unit of Highlands Air Force Station. The unit manned the Texas Tower 4, an offshore radar annex from 1958 until it collapsed into the Atlantic Ocean on 15 January 1961, killing 28 people. The squadron was activated on 1 June 1948, and renamed to the 646th Radar Squadron on 1 October 1958.
