U.S. Marines assigned to Marine Heavy Helicopter Squadron 366 perform a foreign object damage (FOD) walk prior to a routine maintenance check at Marine Corps Air Station Cherry Point, N.C., July 10, 2015. The FOD walk was conducted to maintain cleanliness and safety on the flight line and within the squadron hangars. (U.S. Marine Corps photo by Lance Cpl. Koby I. Saunders/Released)