Retired Navy Admiral Harold W. Gehman Jr. (foreground), chairman of the Columbia Accident Board, is greeted after his arrival at the KSC Shuttle Landing Facility. Gehman and other members of the board, seen disembarking from the plane, are visiting sites at KSC to become familiar with the Shuttle launch process. The independent board is charged with determining what caused the destruction of the Space Shuttle Columbia and the loss of its seven-member crew on Feb. 1 during reentry.