A photograph taken in Beavercreek has some hoping it's proof of top-secret 'pulse jet' tests. BEAVERCREEK — A Beavercreek man's photograph of an unusual aircraft condensation trail has sparked a high-flying debate among scientists and aviation fans over whether the Air Force or NASA is flying an aerospace vehicle with an exotic new propulsion system. The photo of the vapor trail, taken Nov. 10 by amateur meteorologist Bill Telzerow from his backyard, shows a distinctive "doughnuts-on-a-rope" shape. The photo has raised questions about whether an experimental propulsion system that uses pulse detonation engine technology is being tested here. The propulsion...