CF-18 Hornets from the 425th Tactical Fighter Squadron, Royal Canadian air force, taxi down the runway May 6, 2015, prior to a RED FLAG-Alaska (RF-A) 15-2 mission at Eielson Air Force Base, Alaska. RF-A exercises are vital to maintaining peace and stability in the Asia-Pacific region. (U.S. Air Force photo by Staff Sgt. Shawn Nickel/Released)