i totally see alley and christenson as friends! mostly because in the scene where bill kiehn dies, he'd been stealing potatoes w/ alley, and alley is saying 'i just left him for a moment, i was just coming back...' and is completely shutting down -- so i get the sense of them having been good friends, and christenson & kiehn were a machine gun team since toccoa so they're obviously close, SO IT's EASY TO MAKE THE JUMP THAT CHRISTENSON AND ALLEY ARE ALSO CLOSE.

yes, intjs are definitely a certain type of leaders/career military! there's also definitely a portion of SJs who go far in the military, because of the structure/rules and their ability to adhere to this easily, but they are a different kind of leader o: i think we see a significant portion of SFs in the paratroopers because SFs tend to be the most risk-taking of the preferences xD (and a surprising amount of NFs are around, too! but NF types tend to believe in the idea of a 'cause', so i can see how that plays into it.)