An Air Force HH-60W Jolly Green II operates at Kadena Air Base, Okinawa, Jan. 14, 2025. (James Johnson/U.S. Air Force) Rotor wash — the powerful wind generated by helicopter blades — forced a teacher’s umbrella open and knocked her off balance, leading to a fatal fall last year at Kadena Air Base, Okinawa, according to an Air Force accident investigation released Wednesday. The Department of Defen