Sword belts in the military are worn around the waist, their purpose being to hold a ceremonial sword. There are various styles of belts available, some which ore worn over the tunic, such as the Sam Browne, the RAF Officers and the Naval Officers. Sword belts can have several components; as well as the waist belt, there are also sword slings, or a sword frog for retaining the scabbard. Often there is a shoulder belt worn with the ensemble to prevent the weight of the sword pulling down the belt. This can also, be achieved by the belts being held in place by hooks on the tunic. Swords can be worn in two positions, raised or hooked up, where the scabbard or frog is attached to a hook to raise the sword to stop it trailing. Alternatively, they can be worn down hanging from the slings or the frog. Sword belt ensembles can be made from a number of materials, but are primarily made from leather, webbing, PVC, or a combination. Sword belt styles differ by the individual services and also often by rank or regiment.