I think both the body count and the dollar amount is low.

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"The United States has spent nearly $6 trillion on wars that directly contributed to the deaths of around 500,000 people since the 9/11 attacks of 2001.

Brown University's Watson Institute for International and Public Affairs published its annual "Costs of War" report Wednesday, taking into consideration the Pentagon's spending and its Overseas Contingency Operations account, as well as "war-related spending by the Department of State, past and obligated spending for war veterans’ care, interest on the debt incurred to pay for the wars, and the prevention of and response to terrorism by the Department of Homeland Security."

The final count revealed, "The United States has appropriated and is obligated to spend an estimated $5.9 trillion (in current dollars) on the war on terror through Fiscal Year 2019, including direct war and war-related spending and obligations for future spending on post 9/11 war veterans.""