U.S. Air Force Airman 1st Class Chanell Um, 33rd Helicopter Maintenance Unit propulsion specialist, replaces the gasket to a fuel selector valve of an HH-60G Pavehawk during a phase inspection, Nov. 3, 2016, at Kadena Air Base, Japan. Pavehawks receive phase inspections every 600 flight hours to maintain and extend the life cycle of the aircraft. (U.S. Air Force photo by Senior Airman Omari Bernard/Released)