Spencer Stone

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U.S. Air Force Airman 1st Class Spencer Stone, one of three Americans that tackled a heavily armed gunman on a Paris-bound train,is greeted by well-wishers after arriving at Travis Air Force Base in Fairfield, Calif., Thursday, Sept. 3, 2015. Stone, who has been undergoing medical treatment in Germany since he and his two childhood friends, National Guardsman Alek Skarlatos and Sacramento college student Anthony Sadler subdued the gunman on a passenger train Aug. 21.(AP Photo/Rich Pedroncelli)