I had been in the military for about 6 months. I was discharged with depression, but I was given an honerable discharge, and if I want to go back in, I just need a shrink's ok.
The biggest complication in being in the military for me was that I wanted to have time to focus on my obsessions, and this I didn't have; plus some of the social aspects of it. If I go back, I will pick something else where you don't have to socialize that much, and I will probably try to become a warrent officer, and not have a ton of NCOs above you in rank.