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SAS
The Special Air Service is the special forces unit of the British Army. The SAS was founded in 1941 as a regiment, and later reconstituted as a corps in 1950. This special forces unit undertakes a number of roles including covert reconnaissance, counterterrorism, direct action, hostage rescue and human intelligence gathering.
SBS
The Special Boat Service is the special forces unit of the Naval Service of the United Kingdom. Together with the Special Air Service, Special Reconnaissance Regiment and the Special Forces Support Group, they form the United Kingdom Special Forces and come under joint control of the same Director Special Forces.