The reason it’s a band of brothers, and not a band of friends, is because you can fight all day long with your brother and still be willing to die for him. J. wasn’t the only misfit in Decaul’s unit. Decaul’s roommate was heavy into alcohol and hard drugs. “We used to get into fights all the time,” Decaul told me. “I’m talking about fistfights.” But the roommate’s peers didn’t get rid of him either, because out in the field the guy worked miracles on artillery pieces. The drug addict and the Klansman—both of whom should have been kicked out—were seen by their fellow marines as contributing members of the unit, useful to the task at hand.