My bet is that this is wayyyy the fuck underestimated. Iraq alone was close to one million.

"Overall, researchers estimated that "between 480,000 and 507,000 people have been killed in the United States’ post-9/11 wars in Iraq, Afghanistan, and Pakistan." This toll "does not include the more than 500,000 deaths from the war in Syria, raging since 2011" when a West-backed rebel and jihadi uprising challenged the government, an ally of Russia and Iran."

Imagine if all of this had been spent on infrastructure, medical care, education, science, space exploration. This is why the US is losing ground economically, culturally, and morally.