Then there's off the battlefield. One waking the other up when they're having a nightmare about losing them, holding each other when the stress from killing people gets too much. The nasty affects of battle are what can bring them so much closer
I love Corporal Klinger. He made a fool and a clown of himself, hoping to get himself kicked out of the Army, but in the end, who was it who chose to remain behind and marry his Korean sweetheart? Gotta love a guy like that!