U.S. Air Force Tech. Sgt. Dustin Legatt, a fuels specialist with the 133rd Petroleum, Oil and Lubricants Flight, reads the result from the free water sample within the JET-A fuel in St. Paul, Minn., July 10, 2019. A fuels specialist is responsible for a wide range of duties that include operating mobile refueling equipment, performing laboratory analysis on petroleum products and documenting fuel transactions. (U.S. Air National Guard photo by Amy M. Lovgren)