My thinking at the moment is that my guy was enlisted in the infantry and then recommended for the AC by his CO during 43. It fits lots of little historical details and manages to describe certain character attributes as well.
Thanks again.
I actually think that would be very unlikely. By 1943 the infantry needed more bodies and once you were in the infantry, pretty much that's where you stayed. Also, a CO isn't going to know a Private or Corporal well enough to recommend them for a transfer. (Unless you are talking about his Platoon Leader, a 2nd Lt, who isn't going to want to let a good man go *and* is so low in rank himself that his recommendation isn't going to carry much weight).
Also, why would an Infantry CO even care about recommending someone for another branch? And why would he specifically recommend someone for the Aviation Cadet program, when he probably isn't that familiar with it, and would have little idea if the character was suited for that.
I think having the character follow the progression described as more "normal" for an aviation cadet would serve you better, at least in terms of "how it more likely would have happened" and "suspension of disbelief."
He could be one of the men who signed up to be an Aviation Cadet, and was put "on hold" due to the lack of training facilities, and was then told he could (or "should")enlist as an enlisted man while he waited for a spot to open. That would get him into the military, give him a chance to go through some basic training, and give you an opportunity to show how well he adopted to military life (or not).
Heck, you could probably get away with him being temporarily assigned to an infantry unit, with their knowledge that he was waiting for a Aviation Cadet spot to open up, if you really want him to be in the infantry. (It might not have happened that way, but it's closer to "real life" and definitely SEEMS more reasonable than a straight up "transfer from infantry Private to Aviation Cadet on someone's recommendation" scenario).
In that scenario he may also have to "sweat it out" as whether he will be assigned a spot as an Aviation Cadet before something happens that would get him "stuck" in the infantry unit. (Like the Aviation Cadet program closing, or his unit deploying overseas before he gets his transfer orders, etc).
Another thought is that he could join the Aviation Cadet program, be told there are no spots available yet, and be requested to enlist as enlisted so he's "in the system" when a spot becomes available, and then, after he's gone through basic training, be held back as an instructor in some area (not a full fledged Drill Instructor, more like an adjunt instructor in some speciality) because of his proven ability in that area.
I have heard stories of guys who qualified as Expert on the rifle range being held back after basic training to act as assistant rifle marksmanship instructors for the next class, especially when there is a big surge in recruits, new training centers being opened, etc, which caused a related shortage in experienced instructors.
I've read of the same sort of thing in the specialized schools: Guys who did really well on radio theory (pre-war HAM operators usually) who were held back as instructors in that area or pilots being held back as basic flight instructors after graduation, etc.