in London, and described the existence of secret detention facilities (black sites) run by the CIA in Central and Eastern Europe. The Swiss government did not officially confirm the existence of the report, but started a judiciary procedure for leakage of secret documents against the newspaper on 9 January 2006. Lakes flotilla The maritime branch of the Army maintains a flotilla of military patrol boats to secure several sizeable lakes that span Switzerland's borders. These boats also serve in a search and rescue role. During the Second World War Switzerland fielded the Type 41 class of patrol boats, armed with the 24 mm Type 41 anti-tank rifle—not a personal weapon at , and later replaced by a 20mm auto-cannon—and machine guns. Nine units were commissioned between 1941 and 1944. These boats were upgraded in 1964, notably receiving radars, radios and modern armament, and were kept in service into the 1980s, the last being decommissioned in late 1983. The force utilises later the Aquarius-class (Patrouillenboot 80) riverine patrol boats, which are operated by Motorboat Company 10 of the Corps of Engineers and which patrol lakes Geneva, Lucerne, Lugano, Maggiore and Constance. In June 2019 Finnish shipbuilder Marine Alutech delivered the first four of 14 Patrouillenboot 16, the Patrouillenboot 80's successor, to the flotilla and these boats's manufacturer designation as Watercat 1250 Patrol; all ships of this class will be named for astronomical object. Roles The prime role of the Swiss Armed Forces is homeland defence. Switzerland is not part of any multinational war-fighting structure, but selected armed forces members and units do take part in international missions. Military and civil defence After World War II, Switzerland began building homes with 40 cm-thick concrete ceilings that might survive firebombing of the type that destroyed Hamburg and Dresden. In the 1960s they began constructing radiation and blast shelters that could survive one to three bars (100–300 kPa) of pressure from a nuclear explosion. Building codes require blast shelters, which are said to be able to accommodate 114% of the Swiss population. Small towns have large underground parking garages that can serve as sealed community shelters. There are also hospitals and command centres in such shelters, aimed at keeping the country running in case of emergencies. Every family or rental agency has to pay a replacement tax to support these shelters, or alternatively own a personal shelter in their place of residence; many private