LANGLEY AIR FORCE BASE, Va. – Rocks, bolts, and other objects are picked up during a foreign object damage or FOD walk Nov. 10. FOD is any damage to an aircraft, engine, aircraft system, component, or aircraft ground equipment caused by a foreign object. “FOD prevention helps protect the engines and everything going on the flight line,” said Master Sgt. Michael Bumgardner, 1st Component Maintenance Squadron programs flight chief and FOD monitor. (U.S. Air Force photo/Tech. Sgt. April Wickes)