United Kingdom Special Forces
United Kingdom Special Forces (UKSF) is a directorate composed of 22nd Special Air Service Regiment, the Special Boat Service, the Special Reconnaissance Regiment, the Special Forces Support Group, 18 Signal Regiment and the Joint Special Forces Aviation Wing and the supporting troops.  In English law, “special forces” means those units of the armed forces of the Crown and the maintenance of whose capabilities is the responsibility of the Director of Special Forces or which are for the time being subject to the operational command of that Director.

Formation
In 1987, the post of Director SAS became Director Special Forces. From that time, the incumbent has had control of both the Army's Special Air Service and the Naval Service's Special Boat Squadron, which was renamed the Special Boat Service during the formation. The directorate has since been expanded by the creation of the Joint Special Forces Aviation Wing, the Special Reconnaissance Regiment, 18 Signal Regiment and the Special Forces Support Group. Approximately 40% of all UK Special Forces are recruited from the Royal Marines. Following the Army 2020 reforms, in 2014, 21 Special Air Service Regiment (Reserve), 23 Special Air Service Regiment (Reserve) and the Honourable Artillery Company were shifted from DSF's command to 1st Intelligence, Surveillance and Reconnaissance Brigade.

Component units
The following units are part of UK Special Forces and UK Special Forces (Reserve).

Royal Navy 

Special Boat Service
C Squadron
M Squadron
X Squadron
Z Squadron
 Special Boat Service (Reserve)

British Army 

22nd Special Air Service Regiment 
A Squadron
B Squadron
D Squadron
G Squadron
Special Reconnaissance Regiment

Royal Corps of Signals

18 Signal Regiment

Joint service units 

Special Forces Support Group
 A Company
 B Company
 C Company
 D Company
 F Company
 G Company
Support Company
Joint Special Forces Aviation Wing
No. 7 Squadron (Royal Air Force)
No. 658 Squadron (Army Air Corps, British Army)
 Special Forces Flight 47 Squadron (Royal Air Force)