Staff Sgt. Matthew Griffith and Tech. Sgt. Sarah Robson of the 28th Civil Engineer Squadron technical support flight, remove Foreign Object Debris from the flightline during a FOD walk on Ellsworth Air Force Base, S.D., Sept. 15, 2011. Groups of Airmen walked the runway and taxiways to ensure the area was free from any debris that could cause damage to aircraft. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)