The 9/11 AUMF has served the United States well. It has provided broad authority for the United States to pursue and dismantle al-Qaeda in Afghanistan and Pakistan, and a foundation to authorize U.S. operations against al-Qaeda elsewhere, and against groups and individuals which have operationally associated themselves with al-Qaeda, like Al Qaeda in the Arabian Peninsula-an expansion that the Congress and U.S. courts have endorsed. With the winding...