I RP as a 35 y.o. Russian dude who served his 24 months as a drafted soldier 17 years ago, so not the usual "straight from the marine corps" or anything. He does don some military equipment. But that's simply because it would be logical to arm and dress your self to the point where you think you can defend yourself against weather and foes. He's simply an opportunist. The whole difference for me is how the character acts as a person. I've tried to set him up as uniquely as I can when it comes to personality, though.