The total number of US soldiers in the war zone in any one year never topped 550,000. In most years the number was far smaller. The number of US persons with exposure to violence-by-gun each year is more than 320 million. In terms of deaths-per-100K the war was much more dangerous. But that's a technical matter. Every large US city has an area, often large,, in which the deaths-per-100K is greater that it was in Vietnam. Ask yourself why. And, in my suburban county bordering a major US city murder is exceedingly rare.