While not enlisted, my entire life has revolved around the military one way or another.
Honestly, they are just people doing their job. Yes, they wear a uniform for part of the day, but so do other people in different facets of life.
Yes, they jerk off and have sex like everyone else. No, there aren't sweaty sex parties where they are all still in uniform, pawing at each other's hot oiled bodies like a 80's porn scene.
Real life is much more boring than the fetish fantasy.
So, if you put a long mirror beside your computer and watch yourself jerk off, it's the same thing with a military guy.