Heraldic badges of the Royal Air Force are the insignia of certain commands, squadrons, units, wings, groups, branches and stations within the Royal Air Force. They are also commonly known as crests, especially by serving members of the Royal Air Force, but officially they are badges. Each badge must be approved by the reigning monarch of the time, and as such will either have a King's or Queen's Crown upon the top of the badge, dependent upon which monarch granted approval and the disbandment date of the unit. The approval process involves a member of the College of Arms (the Inspector of RAF Badges) who acts as an advisory on all matters pertaining to the design and suitability of the insignia and motto.