High Quality Content by WIKIPEDIA articles! Air chief marshal (Air Chf Mshl or ACM) is a senior 4-star air-officer rank which originated in and continues to be used by the Royal Air Force (RAF). The rank is also used by the air forces of many countries which have historical British influence and it is sometimes used as the English translation of an equivalent rank in countries which have a non-English air force-specific rank structure. Officers in the rank of air chief marshal typically hold very senior appointments such as the air force or armed forces commander in those nations which have significant military capability. An air chief marshal may be described generically as an "air marshal".