A number of the ROFs were designated "temporary", for use during the war's duration only. They closed shortly after the end of the Second World War. Other ROFs were designated "permanent" and they remained open into more recent times. In 1957, a Defence White paper led to a reorganisation of the aircraft industry, a restructuring of the British Army and a concentration on missile systems. A number of the "permanent" ROFs closed in the late 1950s, after the end of the Korean War, and others closed in the 1970s. The largest of these, based at the Royal Arsenal in Woolwich, formally closed on 31 March 1967.