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U.S. Air Force Senior Airman Johann Caballero, 86th Maintenance Squadron aerospace propulsion journeyman, shows oil on his hands as the result of conducting maintenance on the engine of a C-130J Super Hercules on Ramstein Air Base, Germany, April 10, 2018. Air Force maintainers are considered mission essential, and are responsible for ensuring the reliability and operational readiness of aircraft. (U.S. Air Force photo by Senior Airman Joshua Magbanua)
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