In which royal event did the RAF first participate in 1919?

The first participation of the Royal Air Force in a royal event took place during the victory parade for World War I in 1919. This significant occasion marked the end of the war and was an opportunity to honor the contributions of the armed forces, including the newly formed RAF, which had been established just a year earlier in April 1918. The event symbolized national pride and acknowledgment of the sacrifices made during the war, making it a fitting moment for the RAF to showcase its role in the conflict.

The other choices revolve around notable events but do not relate to the RAF's initial involvement in royal celebrations. The coronation of King George VI occurred in 1937, long after the RAF's inaugural participation. The wedding of Prince William took place in 2011 and featured various royal traditions but did not include the RAF in its inception. The opening of the Royal Air Force Museum happened in 1972, which again is unrelated to the RAF's early engagements with royal events immediately following World War I.