They stepped out of a big, air-conditioned silver bird, into the kind of heat, and humidity that even Americans raised in the Deep South weren’t prepared for. Once the immensity of the war in Vietnam hit, someone with more time on the ground might greet them with a wry "Welcome to the suck." An apt name as any for the burgeoning war fought to contain communism in Vietnam. But this policy of containment, and a fatal underestimation of the enemy became a quagmire that plunged the United States into its darkest years of the Cold War.