That sounds reasonable to me. Anything else just introduces to many variables. For example, if the aircraft is only moderately damaged but unable to be repaired due to supply shortages, is it a kill? If 50% of the aircraft can be salvaged for re-use, is it half a kill?
To my mind its a kill if any of the following can be verified via camera or witnesses (wherein of course lies the devil in the detail).
1. It hits the ground, including crash landings
2. The pilot bales out
3. it breaks up or catches fire in the air.
Some verification procedures seem pretty dopey. During the Korean conflict the USAAF decided (with what justification I know not) that 15 .50 cal hits should be sufficient to knock down a Mig. As one round in every five was an API, if gun camera footage showed five visible hits they concluded the Mig had been hit fifteen times in total and it was therefore credited as a kill, irrespective of whether it was seen to crash, flame or fly merrily on it's way. Just possibly such criterion might have contributed to the Sabre's amazing kill/loss ratio in that conflict
That would be the USAF during the Korean WAR, not the USAAF.
We were still using .50 cal with Korean War era date of manufacture, or even earlier in 1967 while I was in SEA.
The belt mix was 4 api and 1 tracer.
Have you got any source for that USAF policy?