Operation Enduring Freedom

Operation Enduring Freedom (OEF) was the official name used by the U.S. government for both the first stage (2001–2014) of the war in Afghanistan (2001–2021) and related military operations during the broader-scale global war on terrorism. On 7 October 2001, in response to the September 11 attacks, President George W. Bush announced that airstrikes against al-Qaeda and the Taliban had begun in Afghanistan.

Source: Wikipedia — Operation Enduring Freedom (CC BY-SA 4.0)