I really just don't see tanks being at all a consideration if a major power sets its eyes on Vietnam. The deterrents are, like you say, the lack of resources, and like I say, guerrilla warfare and naval harassment. There will never be a situation where anybody's sitting in a war room and going like, "I dunno about invading Vietnam, they just got some new tanks." Agree to disagree I guess because this doesn't seem to be going anywhere.