U.S. Air Force Senior Airman Janelle Benavidez, 35th Maintenance Squadron Nondestructive Inspection journeyman, fills a sample holder with oil standard to be tested as part of the Joint Oil Analysis Program at Misawa Air Base, Japan, March 11, 2014. The JOAP tests aircraft engine oils every 25 hours to assess metal levels. (U.S. Air Force photo/Senior Airman Derek VanHorn)
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