| United States|| Bombardment|
| 1943-1945; 1958–1959; 1962–1994|
United States Air Force
The 644th Bomb Squadron is an inactive United States Air Force unit. It was last assigned to the 410th Bombardment Wing. It was last stationed at K. I. Sawyer Air Force Base, Michigan, and was inactivated on 21 November 1994.
644th Bomb Squadron Wikipedia
Established as a Third Air Force A-20 Havoc light bomber Operational Training Unit in mid-1943; Deployed to European Theater of Operations (ETO) in mid-1944; assigned to Ninth Air Force in England.
Entered combat in May 1944 and helped to prepare for the invasion of Normandy by assaulting coastal defenses, airfields, and V-weapon sites in France, and marshalling yards in France and Belgium. Supported the invasion in June by bombing gun positions and railway choke points. Assisted ground forces at Caen and St Lo in July and at Brest in August and September by attacking bridges, vehicles, fuel and ammunition dumps, and rail lines.
Moved to France in September, and through mid-December struck defended villages, railroad bridges and overpasses, marshalling yards, military camps, and communications centers to support the Allied assault on the Siegfried Line. Participated in the Battle of the Bulge, December 1944-January 1945, by pounding marshalling yards, railheads, bridges, and vehicles in the battle area. Continued to fly support and interdictory missions, aiding the drive across the Rhine and into Germany, February–April 1945, continuing attacks on enemy forces until the German Capitulation in May 1945.
Most of the squadron was demobilized during the summer of 1945; squadron returned to the United States and was assigned to Seymour Johnson Field, then Myrtle Beach Army Airfield, however was minimally manned and equipped. Inactivated in November 1945.
Reactivated by Strategic Air Command in 1958 as Missile Training squadron at Cooke (later Vandenberg) AFB. Provided training for Royal Air Force personnel in the operation and launching of the PGM-17 Thor Intermediate-Range Missie. Also provided training to SAC personnel on SM-65 Atlas and HGM-25A Titan I Intercontinental Ballistic Missiles. Inactivated July 1, 1959.
Reactivated again as a B-52H Stratofortress strategic bombardment squadron in 1963, replacing a provisional squadron at K. I. Sawyer AFB, Michigan. The squadron conducted strategic bombardment training and air refueling operations on a global scale to meet SAC commitments. From 1964 to 1975, the squadron supported combat operations over Indochina by rotating B-52 and KC-135 flight crews to Guam and Okinawa, participating in Operation Arc Light, Linebacker I and Linebacker II. In 1980, two 644th Bomb Squadron crews (S-21 and S-31) received the Mackay Trophy for "executing a nonstop, around-the-world mission with the immediate objective of locating and photographing elements of the Soviet Navy operating in the Persian Gulf. Remained on nuclear alert until the end of the Cold War, being inactivated in 1994 with the inactivation of the parent 410th Bomb Wing and the closure of K. I. Sawyer AFB, MI.Constituted 644th Bombardment Squadron (Light) on 16 Jun 1943
Redesignated 644th Strategic Missile Squadron on 1 Dec 1958
Redesignated 644th Bombardment Squadron (Heavy), and activated, on 15 Nov 1962
Redesignated 644th Bomb Squadron on 1 Jun 1992
410th Bombardment Group, 1 Jul 1943 – 7 Nov 1945
704th Strategic Missile Wing, 15 Jan 1959
1st Missile Division, 1 Jul – 1 Nov 1959
Strategic Air Command, 15 Nov 1962
410th Bombardment Wing, 1 Feb 1963
410th Operations Group, 1 Sep 1991 – 21 Nov 1994
Will Rogers Field, Oklahoma, 1 Jul 1943
Muskogee Army Airfield, Oklahoma, 4 Oct 1943
Laurel Army Airfield, Mississippi, 10 Jan 1944
Lakeland Army Airfield, Florida, 8 Feb – 13 Mar 1944
RAF Birch (AAF-149), England, 4 Apr 1944
RAF Gosfield (AAF-154), England, 16 Apr 1944
Coulommiers Airfield (A-58), France, 27 Sep 1944
Juvincourt Airfield (A-68), France, 9 Feb 1945
Beaumont sur Oise Airfield (A-60), France, 22 May – 25 Jun 1945
Seymour Johnson Field, North Carolina, c. 24 Aug 1945
Myrtle Beach Army Airfield, South Carolina, 5 Oct – 7 Nov 1945
Vandenberg AFB, California, 15 Jan – 1 Nov 1959
K. I. Sawyer AFB, Michigan 1 Feb 1963 – 21 Nov 1994
A-20 Havoc, 1944–1945
A-26 Invader, 1945
PGM-17 Thor Missile, 1959
HGM-25A Titan I Missile, 1959
SM-65 Atlas Missile, 1959
B-52H Stratofortress, 1963–1994