It was worn on the lower right sleeve of the shirt or jacket or on a leather wrist strap when wearing short-sleeve order. It was divided into "Rav-Samal Miktzoi" ("Specialist Chief Sergeant"; a technical NCO) and "Rav Samal Yekhidati" ("Unit Chief Sergeant"; a command NCO) from 1955 to 1958. A "Rav Samal" (1948–1951) was equivalent to a US Army Master Sergeant or Sergeant Major. The rank insignia was originally an oak leaf in a laurel wreath for the Army, a large yellow anchor in a yellow-bordered (1948) or solid-yellow (1950) hexagon for the Navy, and a large blue Star of David in a bordered circle for the Air Force. The rank was renamed "Rav Samal Rishon" (1951–Present) and was equivalent to a British Army Warrant Officer I (Regimental Sergeant Major). The new rank also received new insignia made of metal: an Oak Leaf over a vertical Sword in a Laurel Wreath. It came in bronze-metal on a red enamel backing for the Army, gold-metal for the Navy, and silver-metal for the Air Force. It was worn on the lower right sleeve of the shirt or jacket or on a leather wrist strap when wearing short-sleeve order. It was divided into "Rav Samal Rishon Miktzoi" ("Specialist Chief Sergeant First Class"; a technical NCO) and "Rav Samal Rishon Yekhidati" ("Unit Chief Sergeant First Class"; a command NCO) from 1955 to 1958. From 1948 to 1951, IDF Ranks for each branch of service (the Ground, Sea, and Air Forces) had unique titles and distinct insignia. Rank insignia for the Navy and Air Force mirrored those of the Royal Navy and the Royal Air Force, respectively.