Staff Sgt. Brian Elrod, 436th Logistics Readiness Squadron fuels laboratory noncommissioned officer in charge, pours fuel into a bottle-method funnel during the fuel testing process at Dover Air Force Base, Delaware, Jan. 12, 2021. The bottle-method test measures levels of water, additives, sediment and particulates in fuel to ensure all aircraft receive the cleanest fuel possible. (U.S. Air Force photo by Airman 1st Class Stephani Barge)