"The Walking Dead"

How did 1st Battalion, 9th Marines come to be called “the Walking Dead” in Viet Nam? I have read that Ho Chi Minh called them that, predicting their destruction, but I doubt that Ho busied himself with one U.S. Marine battalion. I have also read that because of the Battalions’s casualties, extremely high the war, they were named “the walking dead” but if so, by whom, when?

Here is something labeled as the real story (PDF). And they have their own website .

Their website is messed up. History section missing the last 1/2 of the sentence.