U.S. Army Sgt. Thomas F. Allison was killed at sea Feb. 22, 2002 when the MH-47E Chinook helicopter he was in took off from the Philippine Islands in the Bohol Sea off Negros island and crashed into the ocean. He was a member of Company E, 160th Soar during Operation Enduring Freedom. Allison was a Night Stalker, a member of a skilled, secretive commando force that was seeking to rescue a nurse and an American missionary couple when he died. His body was never recovered.