William Walter assembles a rocket-propelled grenade launcher April 26, 2011, at a range on Eglin Air Force Base, Florida. Mr. Walter, with the Air Force Special Operations Command A5 strike requirements office, helps conduct a demonstration of what damage a RPG can do to a helicopter. Mr. Walter, a retired chief master sergeant, was added to the Commando Hall of Honor recently in Tampa, Fla. (U.S. Air Force photo by Senior Airman David Salanitri/Released)