"Leave no one behind" is a credo of the U.S. Marine Corps. It's pounded into recruits in the first days of their 13-week boot camp. Amid the push-ups and the running, that article of faith is repeated again and again. The drill instructor tells you and you never forget his voice. It's a brotherhood. It's a promise. It's a commitment to die for the Marine next to you, even if you don't particularly like him, even if you don't know his name. Copyright © Newsday, Inc. Produced by Newsday Electronic Publishing.