The phrase blue falcon is traditionally used in the military as a stand-in for “buddy fucker” — like, say, the underage private who gets a DUI on the way back from the strip club, then dimes out his comrades for buying him beers. There’s (at least) one in every unit, and he will always find you, and screw you over. Living with blue falcons is a well-worn part of military life.
Joining the military isn’t easy. Remember the days when you got off the bus (and I’m speaking from the enlisted perspective here) and walked into a swarm of yells and screams from big scary men and women? Worst of all, everything you did and everything you said was wrong. But it took courage, a fierce resolve, and the self-confidence to face the unknown.