Sources

1) Washington Post - With a sense of betrayal and relief, Afghans eye a future without U.S. troops

https://www.washingtonpost.com/world/2021/04/16/afghanistan-civilians-us-troop-withdrawal/

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2) Wikipedia - United States military casualties in the War in Afghanistan

https://en.wikipedia.org/wiki/United_States_military_casualties_in_the_War_in_Afghanistan

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3) Washington Post - How 775,000 U.S. troops fought in one war: Afghanistan military deployments by the numbers

https://www.washingtonpost.com/national-security/2019/09/11/how-us-troops-fought-one-war-afghanistan-military-deployments-by-numbers/

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4) BBC - US says troops to leave Afghanistan by 11 September

https://www.bbc.com/news/world-us-canada-56737563