Clean Sweep
Airmen gather for a foreign object debris walk Sept. 21, 2015, at Yokota Air Base, Japan. FOD is any object potentially harmful to an aircraft, ranging from bolts, screws and other metal pieces, to rocks, paper and plastic. FOD can cost the Air Force millions of dollars in avoidable aircraft damage. (U.S. Air Force photo by Airman 1st Class Delano Scott/Released)