U.S. Air National Guard Tech. Sgt. Ryan Morrow and Airman 1st Class John Williams, 136th Maintenance Squadron, propulsion shop, performs maintenance on a C-130 Rolls Royce T-56 turboprop engine at Naval Air Station Fort Worth, Joint Reserve Base Texas, May 18, 2014. Morrow trains Williams on the proper use of technical data while preforming engine maintenance. (Air National Guard photo by Master Sgt. Charles Hatton/released)