The 434th Operations Group is an active United States Air Force Reserve unit. It is the flying component of the Fourth Air Force 434th Air Refueling Wing, stationed at Grissom Air Reserve Base, Indiana.

The 434th Air Refueling Wing is an Air Reserve Component of the United States Air Force. It is assigned to the Fourth Air Force, Air Force Reserve Command, stationed at Grissom Air Reserve Base, Indiana. The 434th Air Refueling Wing principal mission is air refueling. If mobilized, the Wing is gained by the Air Mobility Command. In July 1949, Continental Air Command (ConAC) reopened Atterbury Air Force Base, Indiana, a World War II field, as a training base for reserve flying units and activated the 434th Troop Carrier Wing there the wing initially flew the Douglas C-47 Skytrain, but soon converted to Curtiss C-46 Commandos, and is now operating the Boeing KC-135 Stratotanker.