Pvt. E-2 David Mangold crawls under barbed wire during a series of obstacles in a training course. For the first time in 30 years, the U.S. Army has changed the way it trains new recruits. Core exercises and sprints have replaced bayonets and long runs. David Gilkey/NPR hide caption

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Scott Warner breaks down in tears after addressing members of the press about the exhumation of his son, Marine Pvt. Heath Warner, on Wednesday. His son's grave was the second to be exhumed since the release of an inspector general's report in June about extensive record-keeping problems at Arlington Cemetery. John Poole/NPR hide caption

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Colby Buzzell was diagnosed with PTSD after returning home. Courtesy Colby Buzzell hide caption

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In this video image, President Obama speaks to the nation from the Oval Office about the end of the U.S. combat role in Iraq. APTN hide caption

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