 Road construction activities were observed along Routes 6 and 19, which connected Dien Bien Phu in North Vietnam with Phou Pha Thi and Nam Bac in Laos.Realizing the PAVN would try to destroy the installation, Secord advised the US Embassy in Vientiane to evacuate all US personnel.However, high-ranking US officials insisted that Lima Site 85 should operate as long as possible, as it helped save the lives of US pilots every day it remained operational.