How does one deal with the loss of a military buddy to suicide?

Ask your self why your friend chose to end his life.
Do you see yourself in the mirror? You say your friends fear for your safety. Listen to them. They see things you may not.
If you see yourself as having suicidal thoughts, your first step is to talk about it with someone you trust, preferably someone qualified to help. Second, take steps to avoid making an impulsive decision. Cut back on alcohol intake. Put your guns away. Avoid stressful situations.

I am very sorry that you have this loss in your life. Don't face this alone. You are a valued member of our team. Rely on the strength of your support network while you need it. You will be a better man for it.

I'm very sorry for your loss. First off seek professional counseling to deal with your emotions. They are natural reactions and simply part of being human, not a sign of weakness. Your doctors may not show it unless you specifically ask, probably know more than you think. Prepare yourself to open up and let it out. Sometimes you may think an event or issue is unrelated to your trauma and feelings but when you discuss it all it may help. Admitting you need help is a sign of strength because you are telling yourself you want to get through this bad time and move on. Here on RallyPoint you'll find many that care and are willing to lend a hand.

First, understand that there was nothing you could have done to stop it. I've had extensive experience professionally and sadly, personally. Next, make sure you take care of yourself especially the basics of rest, stress and hunger. It is not easy to lose a brother or friend and that is going to take time. If you feel yourself having thoughts of going down the same road, call the crisis line, talk to a chaplain or similar person who is sworn to hold confidentially until you make an active statement regarding self harm. I also encourage you to not isolate. When we isolate, it is easy to lose perspective and dwell. Feeling alone and hopeless are almost a sure way down that same dark path. Let your friends carry you for while and ask for help. You would have wanted the same for your friend and gladly provided it day or night.