U.S. Air Force Senior Airman Fidencilio Velasquez, 7th Operations Support Squadron airfield manager operation coordinator, checks tires for rocks or other debris before entering the flight line Jan. 12, 2016, at Dyess Air Force Base, Texas. This debris is called FOD, and is a hazard to aircraft engines. (U.S. Air Force photo by Airman 1st Class Austin Mayfield/Released)