The U.S. Air Force Academy Class of 2015 celebrates after sending their hats skyward as the U.S. Air Force Thunderbirds roared over Falcon Stadium in Colorado Springs, Colo., May 28, 2015. Over 800 cadets graduated and became second lieutenants. Deborah Lee James, the Secretary of the Air Force, gave the graduation address. (Air Force photo by Liz Copan) (released)