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Bryan McDonel and his father, Mike, both served multiple tours in Iraq with the National Guard. Bryan was first prescribed painkillers before his deployment, and his dependence on medication prompted a downward spiral. Quil Lawrence/NPR hide caption

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A decade ago, U.S. soldiers were fighting and rebuilding in the Iraqi cities of Mosul and Tikrit. The past few weeks have seen those cities, among others, fall to the Sunni militant group ISIS. Here, a member of the Kurdish Peshmerga forces stands guard Thursday near an ISIS checkpoint in Mosul. Karim Sahib/AFP/Getty Images hide caption

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Arlington National Cemetery is the final resting place for more than 400,000 men and women. Most were members of the armed forces who served in active duty — but not all. Paul J. Richards/AFP/Getty Images hide caption

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