321st Air Transport Squadron
- Activated 1 November 1943 at Maghaberry [General Orders 52, 8th Air Force Service Command, 1Nov43]
- At Langford Lodge by 12 May 1944
- At Grove, Berkshire, by 5 September 1944
- Redesignated as 321st Squadron (C&M) by United States Strategic Air Forces letter, 24 June 1944
