Master corporal (MCpl) () is a military rank used by a number of countries including the Canadian Armed Forces. Canada In the Canadian Armed Forces the rank of master corporal is an appointment of the rank of Corporal in the Canadian Army and Royal Canadian Air Force, however in the Royal Canadian Army Cadets it is instead known as a rank. Its Naval equivalent is master sailor (MS) ( or matc). According to the Queen's Regulations and Orders: (1) The Chief of the Defence Staff or such officer as he may designate may appoint a corporal as a master corporal. (2) The rank of a master corporal remains that of corporal. (3) Master corporals have seniority among themselves in their order of seniority as corporals. (4) Master corporals have authority and powers of command over all other corporals." Master corporal, while formally an appointment, is treated as a de facto non-commissioned member rank, and is often described as such, even in official documents. As mentioned above, the master corporal is senior to the corporal (and its naval counterpart, Sailor 1st Class (S1)). It is junior to the rank of sergeant (Sgt) and its equivalent naval rank, petty officer 2nd class (PO2). Master corporals and master sailors together with corporals and sailors 1st class make up the cadre of junior non-commissioned officers. The rank insignia of a master corporal is a 2-bar chevron, worn point down, surmounted by a maple leaf. Embroidered rank badges are worn in "CF gold" thread on rifle green (Army) melton, or in silver on Air Force blue (Air Force) melton, stitched to the upper sleeves of the Service Dress jacket; as miniature gold metal and rifle-green enamel badges on the collars of the Army dress shirt and Army outerwear jackets; in "old-gold" thread on Air Force blue slip-ons on Air Force shirts, sweaters, and coats; and in white (Army) or dark blue (Air Force) thread on CADPAT slip-ons on the Operational Dress uniform. Insignia for mess kit is determined by branch or regimental tradition. Master corporals normally mess and billet with the Junior Ranks. Within most Canadian Army units, master corporals are commonly nicknamed "master jack" or "jack" by both superiors and subordinates. The nickname is derived from the former equivalent rank of Lance Corporal,(which still is a rank in use with the Royal Canadian Army Cadets.) or "Lance Jack". This is an informality and is