Off topic, but the reason Vietnam played out the way it did was because of China's implicit guarantee that they'd intervene in force if American troops came anywhere close to their borders like during the Korean War.

Fresh off WW2, with a titanic arsenal and industrial base, America and all of its allies couldn't end the war on their terms after China intervened.

That's why the US only did search-and-destroy missions, targeting Vietcong cells in the south and bombing supply lines in Laos. Which didn't matter much.

Once the Americans left, the North marched down a proper army and wrapped it up.