The War in Afghanistan followed the United States invasion of Afghanistan of 7 October 2001, when the United States of America and its allies successfully drove the Taliban from power in order to deny al-Qaeda a safe base of operations in Afghanistan. Since the initial objectives were completed, a coalition of over 40 countries (including all NATO members) formed a security mission in the country called International Security Assistance Force(ISAF, succeeded by the Resolute Support Mission (RS) in 2014), of which certain members were involved in military combat allied with Afghanistan’s government. The war has afterwards mostly consisted of Taliban insurgents fighting against the Afghan Armed Forces and allied forces; the majority of ISAF/RS soldiers and personnel are American.  The war is code named by the US as Operation Enduring Freedom (2001–14) and Operation Freedom’s Sentinel (2015–present); it is the longest war in US history.