Lockheed EC-121 Warning Star - Operational Service - US Air Force

US Air Force

The United States Air Force operated three wings of EC-121s between 1954 and 1978, and three separate squadrons. Until the Vietnam War, the primary mission of EC-121s was to provide complementary early warning radar coverage to the Pacific and Atlantic barriers by flying orbits 300 miles offshore of the continental United States in what was termed "Contiguous Barriers". Their coverage orbits overlapped those of land-based early warning radars.

Initial deployment of EC-121Cs began with the 551st Airborne Early Warning and Control Wing, based at Otis Air Force Base, Massachusetts. Operational on 21 December 1954, the 551st AEWCW subsequently upgraded to EC-121D and later EC-121H Warning Stars. Its Pacific counterpart was the 552nd AEWCW, based at McClellan Air Force Base, California, which became operational on 1 July 1955. After the Cuban Missile Crisis in 1962, the 552nd AEWCW also had administrative control of the 966th AEWCS, based at McCoy Air Force Base, Florida. The 966th had a dual mission: monitoring activity in Cuban airspace and flying Gold Digger missions (continuous tracks of U-2 surveillance missions).

The third Wing to operate EC-121s was the 553rd Reconnaissance Wing, a Vietnam war organization activated in October 1967 and based in Thailand until its inactivation in December 1970 (See BatCat below). In 1966 Lockheed modified 30 ex-USN Super Constellations (2 EC-121P/WV-3 and 28 EC-121K/WV-2) aircraft to EC-121R for the specialized reconnaissance mission flown by the 553rd. Aircraft were delivered to the wing during the course of 1967. The 553rd RW flew over land and off the coast of Vietnam, over Laos and Cambodia, monitoring and retransmitting low-power signals. Usually they orbited the Ho Chi Minh Trail in eight-hour shifts. As it was expensive to operate and it exposed a large crew to enemy fire it was replaced by a smaller airplane.

As the USAF prepared to deploy the E-3 Sentry in the later 1970s, both the 551st and 552nd AEWCWs phased out EC-121 operations by the end of 1975. All remaining EC-121s were transferred to the Air Force Reserve, which formed the 79th AEWCS at Homestead Air Force Base, Florida in early 1976. The active duty force continued to provide personnel to operate the EC-121s on a 24-hour basis, assigning Detachment 1, 20th Air Defense Squadron to Homestead AFB as associate active duty crews to fly the Reserve-owned aircraft. Besides monitoring Cuban waters, these last Warning Stars also operated from NAS Keflavik, Iceland. Final EC-121 operations ended in September 1978. Detachment 1 was dissolved and 79th AEWCS was re-designated a fighter squadron on 1 October 1978.

In 1967, five EC-121S became operational with the 193rd Tactical Electronic Warfare Squadron of the Pennsylvania Air National Guard, responsible for psyops missions under project Coronet Solo. From July 1970 to January 1971 they rotated on 30-to-90-day temporary duty deployments to Korat RTAFB, Thailand, under the name Commando Buzz.