From the source: “Dak Seang Ranger Camp, most all underground, 5 Nov 71.”
From Where We Were in Vietnam:
“Sat in valley in Tri-border area. Regarded by some as most vulnerable SF camp in SVN… ‘Anyone looking at it tactically,’ wrote Gary Beikirch (awarded the MOH for battle here 1Apr70). ‘could see that it appeared to have been designed by Custer and was quite reminiscent of Dien Bien Phu.’”
NVA forces attacked the camp on 1 April 1970, besieging it until May.