_The blue service dress_ uniform consists of a dark blue single breasted coat extending to about eight inches below the waist, with standing collar, buttoned up the front with the buttons concealed by a fly-front, and trimmed around the collar, down the front, around the bottom and up the side seams of the back with one and a quarter inch black mohair braid, the undress cap, plain dark blue trousers and black shoes. The white cap and white trousers are sometimes worn with the blue service dress coat. _The white service dress_ uniform consists of a single-breasted white duck coat extending to about eight inches below the waist, with standing collar, buttoned up the front with five large size gilt navy buttons, with a patch pocket on each breast closed by a flap at the top buttoned by a small size gilt navy button, without braid trimming, and having on each shoulder a shoulder strap (known in the service as a “shoulder mark”) about five inches long and two and a quarter inches wide bearing the insignia which indicates the corps or branch of the Navy to which the wearer belongs and his rank as an officer, plain white trousers, white cap and white shoes. [Illustration: _Photo by G. V. Buck, Washington, D. C._ U. S. Navy. Officer in overcoat _Rank:_ Lieutenant, indicated by the stripes on the shoulder marks and on the sleeves] [Illustration: U. S. Naval officers’ cocked hats and caps 1. Cocked hat, commissioned officers below Flag rank. 2. White cap, officers below rank of Commander. 3. Cocked hat, Flag officers. 4. Flag Officers’ cap. 5. Cap, Captain and Commander. 6. Cap, Staff Officers of Flag rank. 7. Staff Officers, rank of Captain and Commander. 8. Chaplain, rank of Captain and Commander. 9. Cap of officers below rank of Commander. 10. Cap, Warrant Officers. 11. Tropical helmet (not worn at present).] _The winter service aviation uniform_ consists of a cap, coat, breeches and spiral wrap puttees of forestry-green woolen cloth, and tan leather shoes. The cap is exactly the same design and style as the white service cap except that the material of the crown above the black mohair band is of forestry-green cloth. The coat is the same as the white service uniform coat except that the material is forestry-green cloth. Standard navy gilt buttons are worn on this coat and the rank is shown by shoulder marks the same as those worn with the white service coat. [Illustration: NAVAL AVIATION CORPS INSIGNIA] The Naval Aviation Corps insignia consist of a vertical foul anchor surcharged with a shield of the United States with eagle’s wings extending to the right and left of it as shown in the above illustration. These insignia are made of gilt metal and are worn upon the left breast by all Aviators in the Naval Service, that is by all officers and enlisted men of the Navy and Marine Corps who have qualified as Aviators and are detailed to duty with the Naval Aviation Corps.