Special Air Service

The (SAS) is the name of multiple factions in Call of Duty (series). You may be looking for: 
*Special Air Service/World War 2 - The faction version seen in the World War II era games.
*Special Air Service/Modern Warfare - The faction version seen in the original Modern Warfare (series) games.
*Special Air Service/Black Ops - The faction version seen in the Black Ops (series) games.
*Special Air Service/Modern Warfare (Reboot) - The faction version seen in the rebooted Modern Warfare (series) games.
ru:SAS