A Shau Valley was a bad A$$ place. A Shau Special Forces A-camp there was overrun in early '66. Air Force Spad pilot got the MoH landing his A-1 Skyraider on the short airstrip to pick up a downed pilot.

https://en.wikipedia.org/wiki/Battle_of_A_Sau

When I arrived in July 1966, I spent two weeks in 5th SFG Hqs in Nah Trang before being sent to Ban Me Thout, then on the Ban Don A-233. By chance the debriefing files on all the SF men who exiled from the camp where filed in a dust strewn cabinet where I was supposed to "work." The stories were amazing.