43 Commando Fleet Protection Group

The 43 Commando Fleet Protection Group Royal Marines (43 Cdo FP Gp RM), formerly Comacchio Company Royal Marines (1980–1983), Comacchio Group Royal Marines (1983–2001) and Fleet Protection Group Royal Marines (2001–2012), is a 550-man unit of the Royal Marines responsible for preventing unauthorised access to the UK's strategic nuclear deterrent. The unit, based at HM Naval Base Clyde, is part of United Kingdom Commando Force (UKCF).

Source: Wikipedia — 43 Commando Fleet Protection Group (CC BY-SA 4.0)