Founded in 1977 and based at Fort Bragg, North Carolina, Delta Force is one of the most elite and secretive military units in the world. It operates under the US Army Special Operations Command and is answerable to the Joint Special Operations Command (JSOC). It is also known as 1st Special Forces Operational Detachment–Delta (1st SFOD-D). Its structure is modeled after the British SAS (22nd Special Air Service Regiment), which inspired Delta's founder, Colonel Charles Beckwith. Considering its gravity and super-secrecy of work, it has been rumoured to have used various names such as Army Compartmented Elements (ACE), Combat Applications Group (CAG) or Delta.