Darryl Hodge, 733rd Logistics Readiness Squadron fuels facilities fuels distribution systems operator, takes a fuel sample at Joint Base Langley-Eustis, Va., April 10, 2017. Much like liquid oxygen, many steps are taken to ensure quality jet fuel is used to power aircraft on base, to include checking the tank that is currently in use, every 24 hours for water. (U.S. Air Force photo/Staff Sgt. Areca T. Bell)