Maj. Gen. Craig Wills, 19th Air Force commander, pours a sample into a graduated cylinder, Feb. 14, 2020, on Holloman Air Force Base, N.M. Staff Sgt. Christopher Schaver, 49th Logistics readiness squadron fuels laboratory noncommissioned officer in charge, showed Wills how to sample jet fuel in order to demonstrate daily operations. (U.S. Air Force photo by Airman 1st Class Quion Lowe)