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Collapse of the Islamic Republic

By 15 August, almost the entire country was under the control of the Taliban, who had already encircled and were preparing to enter the nation's capital. Ghani fled the country to Tajikistan, and Kabul was captured that same day, with the entire political and military apparatus of the Islamic Republic having collapsed. The remainder of the NATO forces in the country occupied the Hamid Karzai International Airport in Kabul, evacuating hundreds of thousands of servicemen and civilians. In their last act while in Afghanistan, coalition forces destroyed or damaged most of what was left behind in the airport to prevent it from being used by the Taliban, totalling 75 aircraft and over 100 vehicles and other equipment, alongside the airport's anti-air defences, before definitively leaving the country on 30 August, thus meeting Biden's withdrawal deadline.

Biden defended his decision, stating that he did not wish to prolong the "forever war" and blamed the Afghan authorities for not having found a political settlement and fleeing the country for the collapse of the country's government, adding that the collapse had nevertheless "unfolded more quickly than anticipated". According to Biden, the American mission in the country had never been nation-building, but instead a pre-emption of attacks on the U.S. homeland, which he considered to have been a success. Following the coalition's withdrawal, Taliban forces captured the airport and announced they would form a new government shortly thereafter.

Despite the call to have some refugees admitted to the U.S. after the withdrawal of NATO troops, only a tiny percentage of vulnerable Afghans seeking to move to the United States under a refugee resettlement program were admitted to the U.S. Refugees admitted through the P-2 criteria by the State Department's pre-existing Priority 1 program had the only option to be referred to the U.N. High Commissioner for Refugees or a designated NGO.