Reservists from the 940th Air Refueling Wing participate in a foreign object debris walk during a unit training assembly weekend at Beale Air Force Base, Calif. on Jan. 7, 2007. FOD walks ensure the flight line is free from any small objects that may cause damage to jet aircraft engines during normal flight operations. (U.S. Air Force Photo/ Staff Sgt. Luke Johnson)

Reservists from the 940th Air Refueling Wing participate in a foreign object debris walk during a unit training assembly weekend at Beale Air Force Base, Calif. on Jan. 7, 2007. FOD walks ensure the flight line is free from any small objects that may cause damage to jet aircraft engines during normal flight operations. (U.S. Air Force Photo/ Staff Sgt. Luke Johnson)