sentences:  These items of naval heraldry are most commonly found on uniform patches for the ship's crew; unlike ships in Commonwealth navies, which display their symbols on plaques and battle honor boards fixed to the superstructure of the ship, USN ships are not allowed to paint or otherwise fix the ship's heraldry to the exterior of the ship.From World War I to the beginning of World War II, some U.S. Navy ships had these insignia, but World War II brought them into general use.Some designs were created by the ship's personnel, while others were commissioned by professional artists.