I believe it was in the plot ep of ATS where Angel had mentioned he's been
to a lot of wars, including Vietnam....now, I can understand why he was in
WWII (shanghied by the Navy), but why would he go to Vietnam? Curiousity?
I doubt it was for easy blood, as he had a soul...and he certainly didn't
enlist in the Army, otherwise he'd have been exposed to daylight.
I guess he was just bored & wanted to see for himself what he was reading
about in Life magazine or something..