I think taking care of your mental health is just as important as your psychical health. You don't necessarily need to seek out professional help. Sometimes the best option is just talking it out with a friend or someone who's going through the same thing you are. I've been in the military for well over six years. I've seen Marines and Sailors personalities drastically change after combat deployments. I, myself, was having problems when I returned from Afghanistan but I had my squad-mates to help me through whether they knew or not. A lot of guys in the same situation didn't have the support group that I did, instead they fell to alcohol or drugs. Some unfortunately ended up committing suicide. This isn't just a problem within the military, it's everywhere.