63 (SAS) Signal Squadron (Reserve) was formed in 1967 from elements of 41 Signal Regt, 63 Signal Regt, 327 Signal Sqn, and 115 Field Sqn RE.

From its inception the squadron has provided support to 21 and 23 SAS (R), although the role and geographic spread of the squadron has expanded over time and now has posts throughout the UK.

In addition to providing Communications and Information Systems (CIS) support to the reserve component of UK Special Forces (UKSF) on exercises and operations, the squadron also provides support to the Regular CIS component of UKSF.

Source MoD