LANGLEY AIR FORCE BASE, Va. (AFPN) -- Steven Riddick tests an F-22A Raptor model in NASA's 20-foot vertical spin tunnel here. Data gathered from these tests can determine how an aircraft or spacecraft would react to various atmospheric conditions. Mr. Riddick is an aerospace technology engineer for the National Aeronautics and Space Administration. (U.S Air Force photo by Staff Sgt. Eric T. Sheler)