Airman 1st Class John Sanchez, 319th Logistics Readiness Squadron fuels lab technician, prepares a membrane filter to be dries June 12, 2019, on Grand Forks Air Force Base, North Dakota. The filter is baked dry before being used to test the weight of fuel, which must be confirmed clean and water-free prior to use in an aircraft. (U.S. Air Force photo by Senior Airman Elora J. Martinez)