Aug. 15, 2025 59 TES’ MxOT Tests First Live Engine Oil Service on F-22 Raptor In a milestone test that could revolutionize maintenance procedures across the U.S. Air Force's fighter fleet, the 59th Test and Evaluation Test Squadron’s Maintenance Operational Test division at Nellis Air Force Base, Nevada, successfully conducted its first event to service the F-22 Raptor’s F119