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Casualties of War Pfc. John Needham, son and grandson of military men, joined the U.S. Army in 2006 with “the whole goal of giving your life for somebody else”?his comrades?and in Iraq he was awarded the Purple Heart. But he suffered depression and excruciating back pain, crippling post-traumatic stress disorder and addiction to various drugs and vodka. Before enlisting, he had never touched a drink. In 2008 he considered suicide; and in a fight with his drug-addicted former girlfriend, he battered her with his fists. She died in the hospital. He remembered nothing. Private Needham had fallen apart, he said, because he had witnessed “war crimes”; and when he reported them, his comrades mocked him. According to his letter in 2007 to Army officials, members of his company shot Iraqis without provocation. A sergeant killed one, removed the man’s brain, strapped the corpse to the humvee hood and paraded it through town blaring warnings in Arabic. An investigation found no crimes. In Februa...