Greg Crosswhite, a 97th Maintenance Directorate A-Team manufacturing flight sheet metal structures mechanic, cuts excess metal off a pipe that will serve as a replacement hydraulic line for a U.S. Air Force KC-135 Stratotanker refueling aircraft, Feb. 19, 2015. Fabrication has many different materials on hand; sheet metal, rivets, adhesive bonding chemicals, Kevlar and graphite. A quality inspection process is done when the item is ready to re-install on the aircraft, as well as after installation is complete. (U.S. Air Force photo by Airman 1st Class Megan E. Acs/Released)