Approx. 4"

Operation Freedom's Sentinel (OFS) was the official name used by the U.S. government for the mission succeeding Operation Enduring Freedom (OEF) in continuation of the War in Afghanistan as part of the larger Global War on Terrorism. Operation Freedom's Sentinel is part of the NATO-led Resolute Support Mission, which began on January 1, 2015. OFS had two components: counterterrorism and working with allies as part of Resolute Support.

There were 16,551 NATO and non-NATO troops in Afghanistan around February 2020. Around June 2020, that number dropped to 15,937. In February 2021, there were 9,592 NATO and non-NATO troops in Afghanistan.

The self-reported strength of the Afghan National Security Forces consisted of more than 300,000 personnel during 2020. These forces surrendered or fled to neighboring countries during the August phase of the 2021 Taliban offensive, leaving nearly all of the country under Taliban control.

Operation Freedom Sentinel was expected to formally end on August 31, 2021, but was de-facto completed one day earlier on August 30, as the last remaining troops withdrew and was officially terminated by the DoD on October 1, 2021 as it officially initiated its successor, Operation Enduring Sentinel.