Sierra Team Six

Sierra Team Six was a multinational counter-terrorism unit lead by John Price that with backing from the Central Intelligence Agency and MI6, hunted down Omar Sulman, the leader of Al-Qatala and were involved with the assassination of Russian General Roman D. Barkov. Operators of this elite unit comprised of American CIA Operative Alex from the Special Activities Division, John Price and Kyle Garrick from the Special Air Service. and Farah Karim. Members of Sierra Team Six would later join Task Force 141 which was formed after Sierra Team Six's tour in the Middle East.

Sierra Team Six's involvement with the assassination of General Barkov was widely unknown due to a CIA cover-up in order to prevent tensions with Russia from escalating.