The lesson learned from the Vietnam War should have been plain and simple: No More War!
But that's not what happened.
America's Oligarch Enrichment Project, in control of wanting opportunistic self-enrichment specialist politicians, saw the lesson differently.
They saw it as: Get somebody else to get killed and do the killing. Might as well call it: Mercenary Armies for Capitalism!
The bottom line became perpetual profits from war-making; and now we have Al Qaeda, ISIS and Eric Prince-like private soldiering and whatnot!