GROUP CAPTAIN. An officer's rank of the Royal Air Force (Great Britain) introduced on August 27, 1919. A "group" consists of a number of air force squadrons and other ancillary service units, the number varying with requirements, and the officer commanding this formation is the Group Captain. The rank, however, is not confined to the commander of a group but is also held by officers commanding training units and depots. It is equivalent to the rank of captain of 3 years' seniority in the Royal Navy and to a colonel in the British army. (See OFFICERS.)