U.S. Air Force Staff Sgt. Christopher Khamphady, 724th Expeditionary Air Base Squadron electrical power production technician, primes a new oil filter before installing it on a basic expeditionary airfield resources power unit during a 400-hour preventative maintenance inspection at Nigerien Air Base 201, Niger, Feb. 11, 2020. During this type of inspection, the 724th EABS Airmen perform an oil change and replace all of the fuel, oil and coolant filters to ensure the generator is running optimally. (U.S. Air Force photo by Tech. Sgt. Alex Fox Echols III)