Brown University study notes:
“Since late 2001, the United States has appropriated
and is obligated to spend an estimated $6.4 Trillion through Fiscal Year 2020
in budgetary costs related to and caused by the post-9/11 wars—an estimated
$5.4 Trillion in appropriations in current dollars and an additional minimum of
$1 Trillion for US obligations to care for the veterans of these wars through
the next several decades”