branch within the Army Home Guard and ensures that civilian companies and authorities continue operating during times of crisis or catastrophe. The Infrastructure Home Guard is divided into five branches: Transportation Communications Power Supply Water Health All but mainly employees within the five branches can participate in the nine Infrastructure Home Guard Companies situated all over Denmark. The members of the companies assist in keeping their places of work intact and prevent sabotage with use of lethal force. In peacetime the companies typically assist in guarding important railway lines or power plants. Within the Regional Commands are a number of Liaison Officers who are experts in matters concerning the five branches. Manpower from the regular Army Home Guard can then be used with the right guidance in various situations. Naval Home Guard The Naval Home Guard (Marinehjemmeværnet) deals with securing naval installations, patrolling of the Danish territorial waters, and carries out Search and Rescue missions. It supports scientific research for Danish universities, provides vessels for police and customs operations ashore, and supports exercises and training of other military units (navy, special operations forces, etc.). The Danish Naval Home Guard is commanded by a full service naval captain (kommandør) and a staff of professional full-service personnel. The organisation was totally revised by 1 January 2017. The professional staff is supported by voluntary service staff personnel of experts, planning personnel, advisors, specialists and instructors. 37 coastal municipalities have "naval home guard flotillas" – (100–150 riflemen or a small vessel), commanded by volunteer naval lieutenants (kaptajnløjtnanter). Air Force Home Guard The Air Force Home Guard (Flyverhjemmeværnet), supports the Danish air force, the police and other national authorities in their emergency management by securing airports, performing aerial environmental patrols of national waters. The Air Force Home Guard is commanded by a full-service air force colonel. The commander is supported by a small staff of full-service personnel. Municipalities with airfields or in the vicinity of airports have "air force home guard squadrons" – (100–150 riflemen), commanded by volunteer captains. Ranks The Home Guard in civil society The Home Guard often gives so-called ordinary help to other authorities, especially the police. It's especially Police Home Guard companies that aid in directing traffic, but also help for searching for missing persons and objects, and guarding crime scenes and such. During COP15 in 2009, 1200 soldiers from the Home Guard aided the police in Copenhagen. Most of them