U. S. Coast Guard. Warrant officers’ collar insignia
| 1. Master’s Mate | 2. Keeper |
| 3. Boatswain | 4. Gunner |
| 5. Carpenter | 6. Machinist |
The Service Dress Uniform consists of the blue or white service coat, plain blue or white trousers and the blue or white service cap, black shoes being worn with the blue uniform and white shoes with the white uniform. When the sword is worn with this uniform it is suspended from a belt of black leather worn under the coat.
The Blue Service Coat is made of dark blue cloth or serge, with a standing collar, single-breasted, extending to about ten inches below the waist, trimmed around the collar, down both front edges, around the bottom and up the side seams of the back with black mohair braid one and one-quarter inches wide. The sleeves bear the same gold stripes indicating the rank of the wearer as those on the full dress coat, and on both sides of the collar are embroidered the insignia of rank with the insignia indicating Line or Staff in rear of it.
These insignia for commissioned officers of the Line are as follows:
| Captain Commandant | A silver spread eagle with a shield upon his breast. |
| Senior Captain | A silver oak leaf. |
| Captain | A gold oak leaf. |
| First Lieutenant | Two silver bars. |
| Second Lieutenant | One silver bar. |
| Third Lieutenant | No insignia of rank, the Coast Guard insignia only being worn. |
The Coast Guard insignia worn on the collar by commissioned officers of the Line consist of a silver foul anchor surcharged with a gold shield.
Officers of the Staff Corps (Engineers and Constructors) wear the insignia of rank of their corresponding rank in the Line and instead of the Coast Guard insignia worn by the Line officers they wear the insignia of their corps, as follows:
Engineer Officers.—A silver foul anchor surcharged with four gold oak leaves.
Constructors.—A silver foul anchor surcharged with a branch of gold leaves.