Established in early 1943 as a B-25 Mitchell medium bomber Operational Training Squadron under the Third Air Force, it received A-20 Havoc light bombers and trained in ground attack and light bombardment tactics. It deployed to the European Theater of Operations (ETO) in early 1944, assigned to the Ninth Air Force in England. It was inactivated in 1995 at the time of the closure of Griffiss AFB.