Senior Airman Hector Nazario, a fuels laboratory technician assigned to the 28th Logistics Readiness Squadron, performs a test in the fuels lab at Ellsworth Air Force Base, S.D., Dec. 14, 2016. The fuels lab Airmen ensure the fuel going into the aircraft and vehicles is of the highest quality and meet all standards. (U.S. Air Force photo by Airman 1st Class James L. Miller)