By Jon Wertheim He was Hulk Hogan before Hulk Hogan. He leapt to the big screen before it was the sporting standard. And for his final act? He worked in the shadows to topple Hitler. For a few days in 1943, the rumor rocketed around the Camp Ritchie military training center in the Maryland hinterlands. The scuttlebutt went something like this: A famous and cartoonishly muscled professional wrestler, who lately had been moonlighting as a movie star, would be giving the new soldiers a crash course in hand-to-hand combat before their dispatch to the Western Front. It was, of course, preposterous …