Brown University’s Costs of War Project has unveiled its annual report on the budgetary costs and obligations the United States has incurred from the global war on terror. The report estimates that the federal government has spent $5.4 trillion thus far on our post-9/11 conflicts. And at least another $1 trillion in obligations will come due over the next several decades for veteran care.

To put that in perspective, the Marshall Plan, which provided aid to rebuild Europe after World War II (the deadliest conflict in history), cost roughly $135 billion in 2017 dollars, and the current gross domestic product of the U.S. is just north of $20 trillion. This means the “war on terror” has cost more than a quarter of the United States’ annual economic output and around 50 times the price of the Marshall Plan. And even if the U.S. withdrew completely from major war zones and ceased all other related war on terror activities today, the total cost will still continue to rise due to both the costs of veteran care and interest on the debt.