Virginia, in this case there was no Air Force until after World War II. He could have been in the Army Air Corps at first, then automatically have been absorbed into the Air Force when it was formed.
Part of my problem is that I didn't find an enlistment record for when he joined the Army, nor did I find any discharge records, so I don't know if his service was continuous. I suspect it was not continuous because the BIRLS record shows his enlistment date as 1948 and his service branch as Air Force. Even in this case, though, his BIRLS record should be showing the dates of his Army service.