Stainless Steel with silicon Shaetet 13, Navy Commando Bracelet. Adjustable length Originally the S-13 was designated and trained to perform naval raids and underwater commando operations. Aside from being the navy elite unit for special missions, the S-13 is also an elite CT (counter terror) unit which specializes in covert ops deep within enemy's territory combining assault by sea, land and air. Also This unit stopped bandit flotilla from Turkey