This image provided by the U.S. Air Force shows Air Force Chief of Staff Gen. Mark Welsh, right, and Tech. Sgt. Justin Richie, a 341st Maintenance Operations Squadron team trainer, riding in a work cage on Nov. 20, 2012, inside the T-9 maintenance trainer at Malmstrom Air Force Base, Mont. Armed security forces at a nuclear missile base failed a drill in the summer of 2013 that simulated the hostile takeover of a missile launch silo because they were unable to speedily regain control of the captured nuclear weapon, according to an internal Air Force review obtained by The Associated Press. (AP Photo/U.S. Air Force, Beau Wade)
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