An F-15 Eagle assigned to the 104th Fighter Wing, Barnes Air National Guard Base, Westfield, Mass., flies near a Hawaii Air National Guard KC-135 Stratotanker in preparation for inflight refueling during exercise Sentry Aloha 2015 over the Pacific Ocean, Jan. 29, 2015. Sentry Aloha is a joint aerial combat training exercise hosted several times annually by the Hawaii Air National Guard. (U.S. Air National Guard photo by Senior Airman Loni Kingston/Released)