I've also heard that officer pay is exempt from federal tax. True or untrue? That's a nice boon if so.
I strongly considered joining Army or Navy JAG during and after law school, but decided against it because I had planted roots with my girl. I actually regret missing the chance at 26. Be advised that the processes seemed far more competitive than I had anticipated, though I was told by the recruiter that the interview process was the key. He stressed that the concept behind recruitment was to look at the "whole person," a combination of objective and subjective traits, before a decision is made. Only 4% of law school applicants are chosen for Navy JAG. I'm not sure what officer school is like, but I bet the rate is becoming similar.