A quick correction: If they fought during WW II, they were in the Army Air Forces.
Prior to the war, Army personnel were assigned to various branches: infantry, artillery, Air Corps, Quartermaster Corps, engineers, etc.
The Air Corps was responsible for training and materiel.
The Air Corps became the branch for Army aviation in 1926. In 1935, General Headquarters Air Force was created for operational aviation units.
The Army Air Forces (AAF) was established on June 20, 1941, six months before Pearl Harbor with General H. H. (Hap) Arnold as its commander.
In March 1942, the Army Air Corps ceased to exist when its functions were transferred to the Army Air Forces. All other commands (Flying Training Command, Technical Training Command, Ferrying Command) also were shifted into the Air Forces. Thus, all elements of Army aviation were now under one branch.
This means these WWII veterans served in the Army Air Forces. So, when writing about Army aviation in WW II, the correct and inclusive identification is Army Air Forces.