back to much earlier units of Sammarinese military. The Guard of the Rock are the state border patrol, with responsibility for patrolling borders and defending them. In their role as Fortress Guards they are also responsible for the guarding of the Palazzo Pubblico in San Marino City, which is the seat of national government. In this role, they are the forces most visible to tourists, and known for their colourful ceremony of Changing the Guard. Under the 1987 statute, the Guard of the Rock are all enrolled as 'Criminal Police Officers' (in addition to their military role) and act to assist the police in investigating major crime. The uniform of the Guard of the Rock is distinctively red and green, with three dress standards. The ceremonial uniform (1) for festivals, usually worn only by the ceremonial Artillery Company, includes red trousers with a green stripe (two thinner gold stripes for officers), a double breasted green jacket (with red and white lanyard, red cuffs and collars, gold buttons, and red and white dress epaulettes (for officers the epaulettes are gold, and there is a gold edge to the red cuffs)), a black leather belt, and a black helmet decorated with red and white feathers. For normal guard duties (2) the uniform of the main (full-time) Fortress Guard Corps is similar to that described above, but with plain green epaulettes, and a simple black kepi with a single red feather plume in place of the helmet. For routine patrol duties (3) on the border the uniform is simple and modern, with red trousers, green bomber-jacket, and a green peaked hat. For ceremonial duties the Guard of the Rock carry Beretta BM 59 rifles, with the sentry on duty having a fixed bayonet. For patrol duties they are armed with 9mm Glock 17 pistols, and they patrol in green and white patrol cars (see illustrations in gallery, below). Artillery Unit Most members of the Guard of the Rock are full-time soldiers, but there is also a single Company of volunteers called the "Fortress Guard, Artillery Company" which exists for the now purely ceremonial duty of firing the cannon of the Palazzo Pubblico on ceremonial occasions. This volunteer unit maintains the original artillery function of the Fortress Guard. Although both units are part of the same Guard Corps, and wear the same uniform, the Artillery Unit has a totally different military cap badge, as