The following is a list of Royal Air Force air chief marshals. The rank of air chief marshal is a four-star officer rank and currently the highest rank to which RAF officers may be promoted to in a professional capacity. Throughout the history of the RAF there have been 140 RAF officers promoted to air chief marshal and at present two RAF officers hold the rank in an active capacity. These are Sir Michael Wigston, the Chief of the Air Staff (the only dedicated RAF 4-star post) and Sir Stuart Peach who is the Chairman of the NATO Military Committee.