ceased. In 1910, when the Portuguese monarchy ended, the Republic of Portugal abolished all the orders except the Order of the Tower and Sword. However, in 1917, at the end of the Great War, some of these orders were re-established as mere orders of merit to reward outstanding services to the state, the office of grand master belonging to the head of state, the President of the Republic. The Military Order of Aviz, together with the other Portuguese Orders of Merit, had its statutes revised on several occasions, during the First Republic (1910–1926), then in 1962, and again in 1986. The Military Order of Aviz, together with the Military Orders of Christ and of St. James of the Sword form the group of the "Ancient Military Orders", governed by a chancellor and a council of eight members, appointed by the President of the Republic, to assist him as grand master in all matters concerning the administration of the order. The order can only be conferred on military personnel, both Portuguese and foreign, for outstanding service. For Portuguese nationals, a minimum of seven years of service in the armed forces is required as well as an outstanding and exemplary service record. The regulations of the order suggest classes to be conferred according to military rank thus: Army Captains and Navy Lieutenants: Knight Majors and Lieutenant-Commanders: Officer Lieutenant Colonels and Commanders: Commander Colonels, Brigadiers, Navy Captains and Rear Admirals (US RADM, Commodore/US RDML being a virtually non-existing rank in the Portuguese Navy): Grand Officer Major Generals, Lieutenant Generals, Generals, Vice-Admirals and Admirals: Grand Cross. However, a number of further provisions in the regulations of the order allow for exceptions to this general rule. Grades The Order of Aviz, as awarded by the Portuguese government today, comes in five classes: Grand Cross (GCA), which wears the badge of the Order on a sash on the right shoulder, and the star of the Order in gold on the left chest; Grand Officer (GOA), which wears the badge of the Order on a necklet, and the star of the Order in gold on the left chest; Commander (ComA), which wears the badge of the Order on a necklet, and the star of the Order in silver on the left chest; Officer (OA), which wears the badge of the Order on a ribbon with rosette on the left chest; Knight (CvA) or Dame (DmA), which wears