Structures
U.S. Air Force Airman 1st Class Adam Cook, 31st Civil Engineer Squadron structural journeyman, grinds a jagged edge on a metal T-bar segment April 7, 2015, at Aviano Air Base, Italy. Most of the metal work performed by structures Airmen revolves around air ducts, but they also work with hangar doors, metal supports and signs. (U.S. Air Force photo by Senior Airman Austin Harvill/Released)