Operation Enduring Freedom (OEF) was the official name for the U.S.-led military campaign that began on October 7, 2001, in response to the September 11 attacks. The operation aimed to dismantle al-Qaeda and remove the Taliban regime from power in Afghanistan, as they were harboring terrorists responsible for the attacks. This military action marked a significant shift in U.S. foreign policy, leading to a prolonged involvement in Afghanistan and the broader War on Terror.