Which operation marked a deployment in Afghanistan?

Operation Enduring Freedom specifically refers to the military operations initiated by the United States and its allies in Afghanistan in response to the September 11, 2001 terrorist attacks. This operation commenced in October 2001 and aimed to dismantle al-Qaeda and remove the Taliban from power. It marked the United States' significant entry into Afghanistan, shaping the course of U.S. military engagement in the region for years.

In contrast, other operations like Operation Iraqi Freedom pertain to the military campaign in Iraq. Operation Freedom's Sentinel is essentially a continuation of the mission in Afghanistan that started under Operation Enduring Freedom, but it was not the original operation that marked the deployment in Afghanistan. Likewise, Operation Noble Eagle is focused on domestic air security within the United States. Therefore, the recognition of Operation Enduring Freedom as the operation that marked the deployment in Afghanistan is grounded in its historical context and the specific objectives that were set at the onset of the Afghan campaign.