19. Seaman gunner mark, worn below the chevron by petty officers and in place of the rating badge by other men who have qualified as seaman gunners. 20. Gun captain mark, worn by men detailed by the commanding officer as gun captains, on the opposite arm to that on which the rating badge is worn. 21. Gun pointer mark, worn by men who have qualified as gun pointers on the opposite arm to that on which the rating badge is worn; gun pointers of the first class wear the mark with a star above it (Figure 22). 23. The Navy “E,” worn by members of the turret, gun and torpedo crews that make exceptionally high scores on record target practice, and men of the Engineer Division of the ship winning the trophy in the annual engineering competition. Expert rifleman’s mark, worn by enlisted men of the Navy, Marine Corps and Naval Militia qualified as expert riflemen on the left sleeve midway between the wrist and the elbow, and consisting of a square, one inch, containing target rings three-quarters of an inch and one-half of an inch in diameter and a bull’s-eye one-quarter of an inch in diameter, embroidered in blue on white for white clothing, in white on blue for blue clothing and in gray on khaki for khaki-colored clothing. 24. Radio operator, worn by electricians who are radio operators below the rating badge. 25. Torpedoman mark, worn by gunner’s mates who have qualified in torpedoes and mines below the rating badge. 7. Shipwright’s mark, worn by shipwrights in the same place as the rating badge. 14. Hospital Corps mark (the Geneva cross), worn by hospital apprentices on the left arm above the elbow. 17. Ship’s cook of the third and fourth classes, bakers of the second class and officers’ stewards and cooks, worn on the left arm above the elbow. 3. Signalmen, first and second class, worn on the arm above the elbow in place of the