What did this guy get out of fighting in the civil war, ww1, ww2 and Vietnam war?

killing limeys, killing krauts, killing krauts, killing gooks.

Nothing, he doesn't remember any of it.

He's supposed to literally like to kill with an uncontrollable rage

An erection

But he did fight. You literally see him fighting in one of the films.

Experience and a lot of gay sex

What did he get out of fighting for state rights?

If you're basically immortal and enjoy violence, fighting in a war would be like playing the ultimate VR video game

Nothing, it was a stupid intro in a awful movie. Wolverine never fought in the American Civil War or the 'Nam in the comics.