RAF personnel without No 5 dress, such as airmen, junior officer cadets and some non-regular officers, wear No 1 dress with the blue shirt and tie replaced with a white shirt (not Marcella) and black bow tie should the need to wear mess dress arise.
Members of the RAF who do not have access to No 5 dress attire, including airmen, junior officer cadets, and some non-regular officers, follow a different uniform protocol. They wear No 1 dress with a white shirt instead of the blue one, and replace the tie with a black bow tie if they need to attend a formal event.