I've met a couple guys on the forums that are/were aviators, but they are few and far between. I am a combat veteran myself, ground side. DCS has never caused me any issues, ARMA has given me minor anxiety symptoms at random times. There are PTSD treatment techniques that involve simulating combat, but I have never seen them. I think there is still a lot of research and testing to be done to prove their effectiveness. None of my combat vet friends play ARMA or DCS, mainly because they aren't into PC gaming.