When the Cold War ended, Canadian Forces were withdrawn from their NATO commitments in Germany, military spending was cut, and air raid sirens were removed across the country. The Diefenbunkers, Canada's military-operated fallout shelters designed to ensure continuity of government, were decommissioned. In 1994, the last active United States military base in Canada, Naval Station Argentia Newfoundland, was decommissioned and the facility was turned over to the Government of Canada. The base was a storage facility for the Mk 101 Lulu and B57 nuclear bombs and a key node in the US Navy's SOSUS network to detect Soviet nuclear submarines. Canada continues to participate in Cold War institutions such as NORAD and NATO, but they have been given new missions and priorities.