MOD Caledonia is a DE&S site and its role is to provide the best support services to the RN and more generally the MOD, on the east coast of Scotland. It provides accommodation and support for naval personnel standing by the ships and submarines in refit at the nearby Rosyth dockyard. The site is home to the Naval Regional Commander Scotland and Northern Ireland (NRCSNI), Royal Naval Reserve Unit HMS Scotia and the Royal Marine Band Scotland.
The Band of HM Royal Marines Scotland is accommodated in a purpose built Band Room at the Royal Naval Support Establishment MOD Caledonia Rosyth. Scotland Band is unique as it is the only Royal Marines Band stationed north of London.