CB Seabee WW2 CPO USN Blue Cloth Rating Badge Dated 1942. Originally Petty Officer Seabees of all trades wore this rating badge on the left sleeve but confusion arose quickly in determining the specialties of the men. Very early in 1943 the men were ordered to change to their standard rating badge of Carpenter's Mate, Machinist's Mate, Electrician's Mate etc. and the CB in block letters became a distinguishing mark to be worn on the lower left sleeve.
