U.S. Army parajumpers from the 1st Brigade Combat Team, 82nd Airborne Division, stand ready for the “green light” April 16, 2015, at Polk Army Airfield, Louisiana. During Combined Joint Operational Access Exercise 15-01, U.S. and British mobility aircraft dropped more than 4,500 parajumpers and thousands of tons of equipment during day and night operations. (U.S. Air Force photo by Senior Airman Peter Thompson/Released)