Welcome Strife, and thank you for your Army service.
I can sure understand your need to numb the feelings of sadness & loss you're trying to cope with. Drinking only masks them, though - nothing gets dealt with in a meaningful way. I agree that AA might be a good thing to try - to get your mind off your circumstances for one thing. Everything seems bleak right now, but nothing stays the same forever. You can pull yourself up out of this - I did after many years of drinking and isolating. Yes, it felt strange at first - but if you give yourself chance to heal you'll see you still have a wonderful life ahead of you. Please let us know how it's going for you.