The 321st Air Expeditionary Group (321 AEG) is a provisional United States Air Force Air Combat Command unit. It now appears to be the 321st Air Expeditionary Training Group at COB Speicher, Iraq, supervising Iraqi Air Force training. The group's World War II predecessor unit, the 321st Bombardment Group (Medium) flew B-25 Mitchells in combat with the Northwest African Strategic Air Force in 1943 and the Mediterranean Allied Tactical Air Force in 1944-45. The group was assigned to the 12th Air Force of the United States Army Air Forces during World War II.