A U.S. Air Force F-15 Strike Eagle from the 142nd Fighter Wing, Oregon Air National Guard, refuels from a KC-135R Stratotanker from the 96th Air Refueling Squadron, during the Hawaii Air National Guard exercise Sentry Aloha over Hawaii, March. 5, 2015. This is second large-scale Sentry Aloha fighter exercise in 2015 hosting 45 aircraft and more than 1,000 servicemen from seven states. (U.S. Air Force photo by Tech. Sgt. Aaron Oelrich/Released)