The SBS is under the Operational Command of Director Special Forces, which allocates resources to the Permanent Joint Headquarters, deployed forces or other tasks as required. Qualified personnel are known as "Swimmer Canoeists" and are employed in one of the operational squadrons, training wing or elsewhere in the RM, RN, DSF or MOD.
- X Squadron –
- A joint Army SAS and Naval SBS unit made up of proven operators tasked fighting terrorism. It is known as X Squadron and is led by a highly-decorated SBS officer and an SAS captain. The group, based at Poole, Dorset, are on 24-hour worldwide alert. Rotates along with C Squadron through three specialist roles.