Air Force Staff Sgt. Elliot Verdugo performs pre-flight checks on an F-15C Eagle fighter aircraft during Sentry Aloha 18-01 at Joint Base Pearl Harbor-Hickam, Hawaii, Jan. 11, 2018. Verdugo is a crew chief assigned to the California Air National Guard’s 144th Aircraft Maintenance Squadron. Air National Guard photo by Senior Master Sgt. Chris Drudge