Richard Marcinko was the U.S. Navy's most unconventional warrior -- and its most deadly. A master practitioner of the, "Let's Do It to Them Before They Do It to Us," school of survival, he was often as feared by his own high command as by the enemy.This brilliant, tough-as-nails military virtuoso of violence -- ambushes, booby, traps, exotic weaponry, high altitude parachute drops, underwater infiltrations, face-to-face killing -- rose through Navy...