A formation of F-16 Fighting Falcons progresses down the flight line at Kunsan Air Base, Republic of Korea, March 2, 2012, in a show of power called an âElephant Walk.â The highly-maneuverable F-16s can reach a speed of 1,500 mph and are used for air-to-air combat and air-to-surface attack missions. (U.S. Air Force photo by Senior Airman Brigitte N. Brantley/Released)