P-39 - Went to Russia to be used in ground attacks - Russia's tank buster
P-47 - USA ground attact a/c - USA's tank buster
Stuka - Germany's ground attack - tank buster
Japan - SOL
Urnst Udet was amazed with our Curtiss Hawks (The bi-planes) He urged the Germans to purchase one for testing. It was the Curtiss Goshawk, exports were called Goshawk II. Udet used this aircraft for dive bombing tests which eventually lead to the Stuka.