Wonder why he joined it in the first place. I also wondered why he didn't just fiht for the Viet Cong. Notice that he absolutely detests the NRA too. Maybe he wants an open society together with the terrorists, e "multiculturalists" and the liberals/socialists/communists.
I think he joined to enhance his resume. Fleeing to Canada wouldn't look good of a resume. You notice he only signed up for the least dangerous actions. Not that many, many didn't do the same thing when they joined other branches who were less likely to be sent to Nam. It was his cut and run after 3 baby boo, boos that was the worst of his military stint. And his pacifist activities after he came back.