It was last active with the Army Air Forces Proving Ground Command, based at Eglin Field, Florida, where it was disbanded on 1 April 1944.

In 1944, the group conducted "Operation Crossbow" program to determine the best method of attacking German V-1 "buzz bomb" sites along the French and Dutch coasts, February 1944.

Began testing the Republic-Ford JB-2, an American version of the German V-1, which became the foundation of the Air Force guided missile program, October 1944.

[8] The AAF found standard military units, based on relatively inflexible tables of organization were proving less well adapted to the support mission.

[15] The 611th AAF Base Unit was discontinued on 9 July 1948, when the Air Proving Ground Command reorganized according to the Wing/Base (Hobson Plan) model.