Originally posted by basiliskhe was pretty young when he was in the SS program, after his treatment he was put through the ringer, then was hot dropped into WWII.
It has been stated around the place that Captain America (Rogers) is a master of all (or many) forms of martial arts.However unlike Batman he didn't train since childhood - his background as an American born in 1917, growing up in NY, and being a physically weak 4F means that he definitely didn't learn anything prior to becoming Cap.
He had less than three and a half years of WWII activity between creation and being frozen, most of which seemed to be with his platoon on the front. At least some of whatever training time he did have must have spent been mastering the shield. And several flashback stories seem to indicate he wasn't as adept at fighting during much of his WWII period as he is now.
Exactly when did he master all these martial arts?
after he was freed from the ice, that's when he expanded on his repertoire, cause well, japan wasn't the enemy anymore. add the connections tony has and his long seat at head of the avengers, and his liaison with shield, that's when he really started training harder.
but, he really sticks with a few core styles, but uses moves outside of them to get the job done.