He's in a great MOS. Each Combat Aviation Brigade has an ATC Company within the General Support Aviation Battalion, but every BN uses them when fighting (or training as a task organization). No matter where he goes, he will most likely deploy to Europe, Afghanistan, or elsewhere. If he is asked where he wants to go Korea is a good opportunity to get away and see parts of the world. Keep in mind the Army also has two two ATC Battalions...one at Fort Bragg, 3-58 AOB, and one in Korea (I think).

As for fixed wing/rotary wing controlling...I am not an expert, but my Command Sergeant Major (CSM) was a former ATC guy and I have commanded an organization with ATC personnel. Your son will get a 'pink card' to show the many Army equipment licenses he will obtain in our many ATC systems. I am a big fan of these things systems because our controllers can really stretch our means to communicate and move around in the field. To get a rating that's 'FAA' certified, he will need to work at a fixed facility and there is a little bit of luck involved there, because not everyone works near a fixed facility in which Army 15Qs control the local airspace (Fort Rucker has a lot). They take Soldiers through 6-7 months of training and evaluation to become a Control Tower Operator.

All that to day, his (well kept) training records, pink card, and potential CTO rating can build his resume for later. If he wants to stay aviation, a lot of kids apply for ATC jobs and can be successful regardless of rotary wing or fixed wing centric facilities in which they work...but I think he will lack radar operator experience. Rotary wing airfield handle a lot of sorties in addition to Ground Controlled Approaches (GCAs). They also handle fixed wing, though less than most airports.

I'll be at Rucker next month if he wants to talk. My former CSM is also retired at Rucker if your son wants to talk to an old timer. Feel free to contact me if you have any questions.