Petty officers detailed to duty in the Naval Aviation Corps wear rating badges of the same design as those worn by other petty officers, the number of stripes in the chevron showing the class, three stripes with an arc of a circle above for chief petty officer class, three stripes for first class, two stripes for second class and one stripe for third class, and the specialty marks showing the various classes of duty being as follows: Quartermaster A steering wheel with one eagle’s Aviation wing to the right of it and one to the left of it. Machinist’s Mate A two-bladed airplane propeller Aviation with one eagle’s wing to the right of it and one to the left of it. Carpenter’s Mate Two axes crossed with one eagle’s Aviation wing to the right of it and one to the left of it. [Illustration: U. S. Navy. Petty officers’ rating badges worn on sleeves of uniform coats, overshirts and jumpers. The special detail is indicated by the specialty mark worn in the angle of the chevron 1. Chief Master-at-Arms 2. Boatswain’s Mate, First Class 3. Gunner’s Mate, Second Class 4. Quartermaster, Third Class] [Illustration: U. S. Navy Petty officers’ specialty marks] These specialty marks measure 2½ inches from tip to tip of the eagle’s wings. “Distinguishing marks” are worn by certain enlisted men to indicate special duties or stations to which they are detailed or to show certain qualifications. These marks are embroidered in white silk for blue clothing and in blue silk for white clothing and, as illustrated, are as follows: NUMBER OF FIGURE IN ILLUSTRATION. DUTY OR STATION.