I know that US naval aviators were taught deflection shooting prior to 1939 - although I don't know from what year it started. In that the USN was unique.
It was not taught in the Luftwaffe, RAF, USAAF, Regia Aeronautica or JAAF/JNAF in 1939.
My question is was it adopted officially by any of the above air forces? If so, does anyone know what year it was?
Isn't deflection shooting really just a technical term for the common sense idea of leading your target when it is both moving and at a distance?
IP/Mech THE GREAT GAZOO