Happy valley nickname the Vinh Thanh Valley, during the war a dangerous area northeast of An Khe, South Vietnam US
The mission we had been assigned was simple: an early-morning flight over the An Khe pass toward Qui Hnon; a left turn up between two skinny ridges into Vinh Thanh Valley, known to us as Happy Valley[.] — Robert Mason, Chickenhawk, p. 95, 1983