U.S. Air Force Staff Sgt. Amanda Rubio, 144th Aircraft Maintenance Squadron crew chief, draws an oil sample after an F-15C Eagle fighter jet sortie during Sentry Aloha 18-01 Jan. 8, 2018 at Joint Base Pearl Harbor-Hickam, Hawaii. Sentry Aloha provides tailored, cost effective and realistic combat training for U.S. Air Force, Air National Guard and other Department of Defense services to provide U.S. warfighters with the skill sets necessary to perform their homeland defense and overseas combat missions. (Air National Guard photo by Senior Master Sgt. Chris Drudge)