A number of people, not just you, have made the point that military students would have been much tougher and stronger and more disciplined than civilian students, so they would have learned faster.
But, uh, I'm going to be honest here... most of the service members I've known in my life were just regular people who fixed trucks or did nursing or whatever, and yes, they have to maintain a certain basic level of fitness that many Americans lack, but most service members aren't hardcore athletes. An NCO friend of mine is posted in Japan currently, and she works hard at her job and all, but basically does the bare minimum exercise to pass PT requirements. I'm sure she could go take some karate classes if she wanted, but I doubt she'd learn any faster than any other woman in their 30s.