An F-22 Raptor from the Hawaii Air National Guard's 199th Fighter Squadron taxis out for a morning sortie, while an F-15 from the Massachusetts Air National Guard's 104th Fighter Wing awaits its turn. The fighter and airmen are participating in the "Sentry Aloha" fighter training exercise at Joint Base Pearl Harbor-Hickam, Hawaii, Jan. 28, 2015. (Hawaii Air National Guard photo/Senior Airman Orlando Corpuz)