It's eather or... im a member of the armed forces, Navy to be exact. I've been in five years and normally it's said "Enlist in the Armed Forces." ie. He and/or She is enlist ed/ing in the armed forces.
I would say no, but I am generally anti-union, and I think armed forces would be the very last thing I would want to see unionized. If there are any good arguments for unionization of armed forces I...