my brother went through the air force as an officer. in accordance with what others have suggested, he has a leadership position in a big company, and makes lots of money.
if the work is dangerous, he may become a wolf amongst sheep in the corporate world someday. most people (especially in, for example, technology) are very cowardly. they're afraid of getting yelled at by their boss, lol. when someone has seen people die, killed people, or simply been in combat, they may very well rise through the ranks. of course, they may also become traumatized. depends on their nature, i suppose.