The VN conflict was run from Washington, DC by politicians. The military leaders, according to the US Constitution, are subordinate to the civilian leadership (and the oath of the US military is to the Constitution, not to any individual). Even ground support fire could be and was directed from Eagle One, the White House. Safe and secure thousands of miles away, Johnson and others could play "Army" with real soldier and real bullets and never give a thought to what was happening on the ground.

Much like Hitler and the Eastern Front, actually, only with better commo.

Teribus, remember that US forces fought with and trained the Karin and the 'yards during WW2. If you want a history of the US and jungle warfare (which much of the VN conflict was not, on either side, I suggest you look at the 158th RCT ("Bushmasters"), Merrill's Marauders, and similar units. (No, I do not include the "Green Berets" of the VN era in this.)

But the question is not "What happened in 'Nam?" but is "What happens when the troops return from Iraq?"