The specialty marks indicating the different ranks or “ratings” are, as shown in the illustrations, as follows:

NUMBER OF
FIGURE IN
ILLUSTRATION.		RANK OR “RATING.”
1.Master-at-arms.
2.Boatswain’s mate, or coxswain.
3.Quartermaster.
4.Blacksmith, or shipfitter.
5.Sailmaker’s mate.
6.Printer.
7.Carpenter’s mate, plumber and fitter, painter.
8.Turret captain.
9.Gunner’s mate.
10. Storekeeper.
11.Yeoman.
12.Electrician.
13.Machinist’s mate, boiler maker, water tender, coppersmith, oiler.
14.Hospital corps (red cloth Geneva cross).
15.Bandmaster, musician.
16.Commissary steward.
17.Ship’s cook and baker.
18.Bugler, worn on the left arm above the elbow.

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 AviationA steering wheel with one eagle’s wing to the right of it and one to the left of it.
Machinist’s Mate AviationA two-bladed airplane propeller with one eagle’s wing to the right of it and one to the left of it.
Carpenter’s Mate AviationTwo axes crossed with one eagle’s wing to the right of it and one to the left of it.

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-Arms2. Boatswain’s Mate, First Class
3. Gunner’s Mate, Second Class  4. Quartermaster, Third Class

U. S. Navy
Petty officers’ specialty marks

These specialty marks measure 2½ inches from tip to tip of the eagle’s wings.