In Vietnam you are talking about militants which are being funded an paid for by communist countries -- including planes, pilots, and missiles provided by the Soviet Union & China.
In Iraq, you are talking about militants of multiple religious affiliations who are being paid and armed from multiple countries included Iran.
Similar to the American Revolution none of these militants would have been in existence without help from outside countries.
And furthermore each of these countries (Vietnam, Iraq, & Afghanistan) are examples of global conflict. They are not examples of citizens protesting against the actions of a country's government to remove the administration from power or to drive change.