Helicopters in WW2??? Are you serious? 
There were helicopters BUT, they were not used in a military role. Rotary wing technology was still in its infancy and not ready to be put on the battlefield.
I don't believe there was a single chopper shot down in action during all of WW2 so, pointless imo. 
Guys, he's the idiot who said that the Germans attacked Pearl Harbor, let him have his fun.