title: Royal Canadian Air Force
context: The Canadian Air Force (CAF) was established in 1920 as the successor to a short-lived two-squadron Canadian Air Force that was formed during the First World War in Europe. John Scott Williams, MC, AFC, was tasked in 1921 with organizing the CAF, handing command over later the same year to Air Marshal Lindsay Gordon.[7] 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.[8][9] Many CAF members also worked with the Air Board's Civil Operations Branch on operations that included forestry, surveying and anti-smuggling patrols.[10]  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.
question: When was the Royal Canadian Air Force established?
answers: 1924