It won't have to last 71 years to provide a good fraction of the casualties suffered in Vietnam. It would only have to last about as long as the vietnam war did for that.

Let's say we were in Vietnam for ten years (generous to your argument). If current yearly casualty rates hold in Iraq, we will have had ~7,700 US dead in Iraq after ten years of war. That's only 13% of the US dead in Vietnam over the same length of time. I don't know what you consider a "good fraction" of the casualties suffered in Vietnam to be, but I sure hope 13% doesn't qualify...
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