moved from Northwood to Rota, Spain and to Brest, France on 29 March 2019. Occupants Strategic Command Strategic Command (UKStratCom) is a tri-service organisation managing allocated joint capabilities from the three armed services. Permanent Joint Headquarters Permanent Joint Headquarters (PJHQ) is a tri-service organisation holding Operational Control of British armed forces joint military operation. PJHQ is headed by the Chief of Joint Operations. Single-service operations remain under the operational control of the appropriate front-line command. Royal Navy The Commander Operations commands the operations staff on the Northwood site. Among Commander Operations' responsibilities are command of Commander Task Force (CTF) 311 (UK attack submarines) and CTF 345 (UK nuclear missile submarines). Reservists from , part of the Royal Naval Reserve, who had moved from the Northwood Headquarters site to Brackenhill House on Oxhey Drive South in 1988, moved back into a new building on the Northwood Headquarters site in June 2011. NATO Allied Maritime Command The NATO Allied Maritime Command is based at Northwood, and comes under the Command and Control of the Allied Command Operations. Support units The Headquarters Staffs are supported by: Joint Support Unit Northwood, providing administrative support, life support, facilities and supplier management. Defence Equipment and Support (DE&S) providing Communications and Information Systems support. A detachment of Military Provost Guard Service personnel providing force protection. References External links Northwood Headquarters – Ministry of Defence Allied Maritime Component Command Headquarters Northwood 1938 establishments in England Buildings and structures in Three Rivers District Military command and control installations Military headquarters in the United Kingdom Military installations in England NATO installations in the United Kingdom United Kingdom nuclear command and control Military history of Hertfordshire