2020–2021 U.S. troop withdrawal from Afghanistan

The United States Armed Forces completed their withdrawal from Afghanistan on 30 August 2021, marking the end of the 2001–2021 war. In February 2020, the Trump administration and the Taliban signed the United States–Taliban deal in Doha, Qatar, which stipulated fighting restrictions for both the US and the Taliban, and provided for the withdrawal of all NATO forces from Afghanistan in return for the Taliban's counter-terrorism commitments. The deal, and then the Biden administration's final decision in April 2021 to pull out all US troops by September 2021 without leaving a residual force, were the two critical events that triggered the start of the collapse of the Afghan National Security Forces (ANSF). Following the deal, the US dramatically reduced the number of air attacks on the Taliban at the detriment of the ANSF fighting the Taliban insurgency, leading to the Taliban takeover of Kabul on 15 August 2021.

As part of the United States–Taliban deal, the Trump administration agreed to an initial reduction of US forces from 13,000 to 8,600 troops by July 2020, followed by a complete withdrawal by 1 May 2021, if the Taliban kept its commitments. At the start of the Biden administration, there were 2,500 US soldiers remaining in Afghanistan and, in April 2021, Biden said the US would not begin withdrawing these soldiers before 1 May, but would complete the withdrawal symbolically by 11 September. The Taliban began a final offensive on 1 May and, on 8 July, Biden moved up the completion date to 31 August. There were about 650 US troops in Afghanistan in early August 2021, tasked with protecting Hamid Karzai International Airport and the US Embassy in Kabul. NATO's Resolute Support Mission concluded on 12 July 2021 while US intelligence assessments estimated as late as July that Kabul would fall within months or weeks following withdrawal of all American forces from Afghanistan, the security situation deteriorated rapidly.

The US also launched Operation Allies Refuge to airlift the American translators and select Afghan citizens considered at risk of reprisals and US Forces Afghanistan Forward was established on 7 July 2021 as a successor command overseeing the evacuation of all American diplomatic, security, advisory, and counter-terrorism personnel remaining in the country after the withdrawal of US troops. On 12 August 2021, following continued Taliban victories across Afghanistan, the Biden administration announced that 3,000 US troops would be deployed to Kabul Airport to evacuate embassy personnel, US nationals and Special Immigrant Visa applicants. With the rapid advance of the Taliban in the provinces, on 14 August the US increased its troop commitment to 5,000. On 15 August, with the fall of Kabul, another 1,000 troops were deployed, and on 16 August, a further 1,000 troops were deployed, bringing the total number of troops to 7,000. The last US military planes left Kabul airport at 11:59 p.m. Kabul time on 30 August 2021.

Following the US withdrawal, around one thousand American citizens and Afghans holding US or other visas were held up by the Taliban with the US government not authorizing their departure. On 28 and 29 September 2021, US Secretary of Defense Lloyd Austin, Chairman of the Joint Chiefs of Staff Gen. Mark Milley and United States Central Command (CENTCOM) commander Gen. Frank McKenzie were among the numerous Defense Department officials who denied during Congressional testimonies President Biden's previous claim that his decision to withdraw troops from Afghanistan was because of advice from senior US military leaders and stated that they had in fact advised him to keep some troops in Afghanistan. Provided by Wikipedia