I'm in the Air Force.
Three things:
1. Pick your career carefully. Do your research and don't just take the recruiter's word for it. There are many jobs in the armed forces that have nothing to do with killing people. Choose the right job for you.
2. The military is a big commitment. If you decide that it's not to your liking, it's not that easy to simply pick up and leave without there being some serious consequences.
3. Don't lie. If you have a diagnosis or are on meds, come clean at MEPS. If they have to do a background check for a security clearance, or if they happen to find out for any reason, it's called "fraudulent enlistment." Yes, you can get in trouble for it.
Other than that, it really depends on you. I've had good times, and I've had bad times. I've also learned that an active flightline isn't the best place for ME. Good luck.
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"If we fail to anticipate the unforeseen or expect the unexpected in a universe of infinite possibilities, we may find ourselves at the mercy of anyone or anything that cannot be programmed, categorized or easily referenced."
-XFG (no longer a moderator)