Task Force 141 is a multinational special operations unit comprised of members from the United Kingdom, United States, Canada and Australia. The operators within Task Force 141 are from a number of Special Forces units including: the British 22nd Special Air Service Regiment (Soap, Ghost, Price and Roach), the Royal Marines Special Boat Service, DEVGRU (SEAL Team Six), US Army Special Forces (Green Berets), US Army Rangers, Combat Applications Group (Delta Force), US Marine Special Operations Command (MARSOC), the Canadian Joint Task Force 2 and the Australian Special Air Service Regiment (Rook). The task force also receives intelligence support from the CIA (Central Intelligence Agency).

Text from http://callofduty.wikia.com/wiki/Task_Force_141