Off-duty US Air Force Spencer Stone (L), one of the men to overpower the gunman who opened fire with an assault rifle on a high-speed train, gestures as he leaves the hopistal of Lesquin, northern France on August 22, 2015. On August 21, 2015, a gunman opened fire on the train travelling from Amsterdam to Paris, injuring two people before being tackled by several passengers including off-duty American servicemen. Spencer Stone was first to the gunman who slashed him in the neck and almost sliced off his thumb with a box-cutter.AFP PHOTO / PHILIPPE HUGUEN / AFP PHOTO / Philippe HUGUEN        (Photo credit should read PHILIPPE HUGUEN/AFP/Getty Images)