I have been a "youth" and I have children 18 and 20 and I do NOT consider this normal behavior. But maybe I was raised differently. You sound like a moral relativist to me.
It's definately out there now for 18-25 year olds everywhere in America, usually worse.
The question is; Were you ever a Soldier in a hot war? I'd be willing to bet that all the "moral purists" on this thread aren't, you're "mommies" or thumpers who've never had a bullet go by your ear.
Since I have, let me tell you that I suspect these warriors took a chance, and now that the cat's out of the bag they'll shut up, take their lumps, and keep doing their job. You're perfectly entitled to maintain your moral superiority and feel all virtuous about yourself. Our soldiers will continue to fight and die for your right to do so, regardless of your opinion of how they decompress among their peers!
You need to get out more.