The Ministry of Defence Guard Service (MGS) is part of the Defence Infrastructure Organisation of the Ministry of Defence, and provides military establishments across the United Kingdom with unarmed security guards and patrol services. The MGS deals with access and pass control, key control, vehicle and personnel searching, security patrols of buildings and perimeter fences, dog patrols, CCTV, and alarm monitoring. It also performs other duties like helicopter marshalling, first aid provision, mail and baggage scanning, security sweeps, and health and safety guidance.