Military aid to the civil authorities (MACA) is the collective term used by the Ministry of Defence of the Government of the United Kingdom to refer to the operational deployment of the armed forces of the United Kingdom in support of the civilian authorities, other government departments and the community as a whole.[1] Commander Home Command, in his capacity as Standing Joint Commander (UK) is the standing joint commander responsible for the planning and execution of civil contingency operations within the UK landmass and territorial waters during any military aid to UK civil authorities.[2]