U.S. Air Force Capt. Thomas Hixon, 46th Expeditionary Reconnaissance Squadron, chases a piece of trash down the flightline during a routine Foreign Object Debris Walk or “FOD Walk” at an undisclosed location in Southwest Asia, May 15, 2015. “FOD” is any substance, debris or article foreign to an aircraft system which could potentially cause damage. (U.S. Air Force photo/Tech. Sgt. Brittany E. Jones)