521st Fighter-Bomber Squadron

Its last was assigned to the 415th Bombardment Group, stationed at Dalhart Army Airfield, Texas.

Assigned to the Army Air Forces School of Applied Tactics, Air University in Florida as a training unit to develop combat tactics to be used by overseas combat units.

When AAFSAT closed, was re-assigned as a B-25 medium training squadron and supported Army maneuvers.

Inactivated in April 1944 with re-organization of training command designations.

This article incorporates public domain material from the Air Force Historical Research Agency