FILE - In this Nov. 7, 2013 file photo, Air Force Chief of Staff Gen. Mark Welsh testifies on Capitol Hill in Washington. A string of nuclear missteps, many uncovered by The Associated Press, have beset the nation's nuclear force in the last year. In November 2013, Welsh, disclosed that as a result of the firing of Maj. Gen. Michael Carey, commander of the 20th Air Force, which is responsible for the entire Minuteman 3 missile force, the Air Force would take a closer look at the background of candidates for general officer-level nuclear command jobs. (AP Photo/Jacquelyn Martin, File)
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