A lot of the damage done by the 9th AF was done by single-engine tactical fighters that continued the work that the Stuka started, in a faster package. The Jug really found its home here, with 8 .50s and a ton of bombs or rockets, and the ability to take a fair amount of flak damage and still get home. The Typhoon was another notable here, especially with rockets. I guess you could say the 9th AF continued what the Luftwaffe taught the Allies about close air support, *but*, it was only one force of several that the Allies had. That was the difference. The Luftwaffe was originally set up in the late 30s to do what the 9th Air Force did, with very little provision for all the other things the Allies did with air power. And by the time they knew it, it was too late to fix.