During the Cold War the headquarters of the Number 20 Group, Royal Observer Corps was moved to the newly constructed York Cold War Bunker in the Holgate area of town. It was opened on 16 December 1961, was in operation until 1991, and was then turned into a museum owned by English Heritage. In 1971 York was made an army Saluting Station, firing gun salutes five times a year such as the Queen's Birthday. The date marked 1900 years of army in York. The University of York was launched on sites at Heslington and the King's Manor and took its first students in 1963. In 1975 the National Railway Museum was opened, near the centre of York.