tasked in 1921 with organizing the CAF, handing command over later the same year to Air Marshal Lindsay Gordon. The new Canadian Air Force was a branch of the Air Board and was chiefly a training militia that provided refresher training to veteran pilots. Many CAF members also worked with the Air Board's Civil Operations Branch on operations that included forestry, surveying and anti-smuggling patrols. In 1923, the CAF became responsible for all flying operations in Canada, including civil aviation. In 1924, the Canadian Air Force, was granted the royal title, becoming the Royal Canadian Air Force (RCAF). Most of its work was civil in nature; however, in the late 1920s the RCAF evolved into more of a military organization. After budget cuts in the early 1930s, the air force began to rebuild. World War II During the Second World War, the RCAF was a major contributor to the British Commonwealth Air Training Plan and was involved in operations in Great Britain, Europe, the north Atlantic, North Africa, southern Asia, and with home defence. By the end of the war, the RCAF had become the fourth largest allied air force. During WWII the Royal Canadian Air Force was headquartered in 20-23 Lincolns Inn Fields, London. A commemorative plaque can be found on the outside of the building. 1945–1968 After the war, the RCAF reduced its strength. Because of the rising Soviet threat to the security of Europe, Canada joined NATO in 1949, and the RCAF established No. 1 Air Division RCAF consisting of four wings with three fighter squadrons each, based in France and West Germany. In 1950, the RCAF became involved with the transport of troops and supplies to the Korean War; however, it did not provide RCAF combat units. Members of the RCAF served in USAF units as exchange officers and several flew in combat. Both auxiliary and regular air defence squadrons were run by Air Defence Command. At the same time, the Pinetree Line, the Mid-Canada Line and the DEW Line radar stations, largely operated by the RCAF, were built across Canada because of the growing Soviet nuclear threat. In 1957, Canada and the United States created the joint North American Air Defense Command (NORAD). Coastal defence and peacekeeping also became priorities during the 1950s and 1960s. 1968–present: Unification In 1968, the Royal Canadian Navy, Royal Canadian Air Force and Canadian Army were amalgamated to form the