FILE - In this Dec. 19, 2013 file photo, Defense Secretary Chuck Hagel takes questions as he briefs reporters at the Pentagon in Washington. In taking a deep look at trouble inside U.S. nuclear forces, Hagel is searching for the root causes of recent Air Force missteps but also for ways to make the nuclear warrior’s job more attractive when the military has turned its attention away from such weapons. (AP Photo/Charles Dharapak)
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