[Vinman]

Hi,
I just purchased the Ospery book and it seems that there are a lot of P40 Aces, according to the author.
Upon further reading, the list in the back inlcudes individul plus shared victories. Also, one ace in particluar, G.W. Troke, is listed with 3 ind + 2 sh and in the book, it states that this includes 2 ground kills.
I thought that an ace's score only included air to air and not ground.
Can anyone shed some light on this?
Vinman.