I know, looks like a U.S. Army Discharge Certificate but it was also used to represent Army Air Force personnel. Note the A.C. next to the Majors name at the bottom. Means: Air Corps
I was discharged at Camp Atterbury, an Army Base. Just happened to be the base used for discharges for personnel in the general area of IN where I was from.
The USAAF was part of the Army until September 1947. But I always considered myself Air Force.
On the reverse of this document is my other discharge document, (similar to the DD-214)...that reflects 'AC'.