Staff Sgt. Ronald Walker provides radio communication to an aircraft crew. U.S. Air Force Staff Sgt. Ronald Walker, a combat controller, provides radio communication to an aircraft crew during a high-altitude, low-opening parachute jump to a remote landing zone at Fort Bragg, N.C., on April 8, 2008. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 426415-J-RPH10-167.jpg Photo Gallery