Master Sgt. Cassandra Doub, the 455th Expeditionary Civil Engineer Squadron first sergeant, and Staff Sgt. Andrew Perna, a 455th ECES maintenance and equipment craftsman, secure AM-2 matting with a hammer at Bagram Airfield, Afghanistan, Aug. 11, 2016. AM-2 matting is used to form runways, taxiways, parking and other areas required for aircraft operations and maintenance. (U.S. Air Force photo/Senior Airman Justyn M. Freeman)