<< 1 & 3 are good & close on 4, but you are out to lunch on 2.
#2 - more bombs was deployed over Vietnam than WWW II. The American tried to bomb Vietnam back to the stone age, but lack of support fromt the public & politic caused the failure.
Also, most GI & South Vietnam weren't into fighting, because they rather drink, smoke pot to forget the point less "conflict". >>
BS, our navy and airforce had their hands tied for the majority of the war when it came to bombing the north. The targets were picked by political reasons, not stratigic reasons. And our army had it's hands tied when it came to keeping land it had taken from the north. We took the same areas over and over, only to be pulled back for political reasons.
You know, you ought to learn about history from more than movies.