The 921st Tactical Airlift Group is an inactive United States Air Force Reserve unit. It was last active with the 433d Tactical Airlift Wing, based at Kelly Air Force Base, Texas. It was inactivated on 1 November 1994.

The 433rd Airlift Wing, sometimes written as 433d Airlift Wing, is an Air Reserve component of the United States Air Force. It is assigned to Fourth Air Force, Air Force Reserve Command, stationed at Kelly Field Annex, Joint Base San Antonio, Texas. If mobilized, the wing is gained by Air Mobility Command.