Original sentence: Although the aircraft was not accepted for combat use by the United States Army Air Forces, it was successfully adopted by the Soviet Air Force
Edited sentence: Angelucci, Enzo and Paolo Matricardi.But  the United States Army Air Forces never considered the type satisfactory for combat, using it exclusively for towing targets.However the Airacobra was successfully adopted by the Soviet Air Force.ISBN 0-562-00096-8.Maidenhead, UK: Sampson Low, 1978.World Aircraft: World War II, Volume II (Sampson Low Guides)