John Rutherford Allen is a retired United States Marine Corps four-star general, and former commander of the NATO International Security Assistance Force and U.S. Forces – Afghanistan (USFOR-A). On September 13, 2014, President Barack Obama appointed Allen as special presidential envoy for the Global Coalition to Counter ISIL. He was succeeded in that role by Brett McGurk on October 23, 2015. He is the co-author of Turning Point: Policymaking in the Era of Artificial Intelligence with Darrell M. West and Future War and the Defence of Europe alongside Lieutenant General (Ret.) Ben Hodges and Professor Julian Lindley French. Allen was president of the Brookings Institution from October 2017 until his resignation on June 12, 2022.

The International Security Assistance Force (ISAF) was a multinational military mission in Afghanistan from 2001 to 2014. It was established by United Nations Security Council Resolution 1386 pursuant to the Bonn Agreement, which outlined the establishment of a permanent Afghan government following the U.S. invasion in October 2001. ISAF's primary goal was to train the Afghan National Security Forces (ANSF) and assist Afghanistan in rebuilding key government institutions; it gradually took part in the broader war in Afghanistan against the Taliban insurgency.