Admiral—four silver stars. Vice Admiral—three silver stars. Rank of Rear Admiral—two silver stars. Rank of Commodore—one silver star. Rank of Captain—a silver spread eagle. Rank of Commander—a silver oak leaf. Rank of Lieutenant Commander—a gold oak leaf. Rank of Lieutenant—two silver bars. Rank of Lieutenant Junior Grade—one silver bar. Rank of Ensign—no insignia. Midshipman—a gold anchor. The insignia indicating the rank and corps of officers are worn on each side of the collar of the blue service coat as illustrated; for Line Officers they are as follows: _Admiral of the Navy_—four silver stars, the two end stars being surcharged upon gold foul anchors. _Admiral_—four silver stars, the star nearest the back being surcharged upon a gold foul anchor. _Vice Admiral_—three silver stars with a silver foul anchor in rear of them. _Rear Admiral_—two silver stars with a silver foul anchor in rear of them. _Commodore_—one silver star with a silver foul anchor in rear of it. _Captain_—a silver spread eagle with a silver foul anchor in rear of it. _Commander_—a silver oak leaf with a silver foul anchor in rear of it. [Illustration: U. S. Navy. Officers’ insignia of rank and Corps on collar of blue service coat, showing right side of collar 1. Admiral of the Navy 2. Admiral 3. Vice Admiral 4. Rear Admiral 5. Commodore 6. Captain] [Illustration: U. S. Navy. Officers’ insignia of rank and Corps on collar of blue service coat, showing right side of collar 1. Commander (Silver leaf) 2. Lieutenant Commander (Gold leaf) 3. Lieutenant 4. Lieutenant, Junior Grade 5. Ensign 6. Medical Officer with the rank of Captain] _Lieutenant Commander_—a gold oak leaf with a silver foul anchor in rear of it. _Lieutenant_—two silver bars vertical with a silver anchor in rear of them. _Lieutenant, Junior Grade_—one silver bar vertical with a silver foul anchor in rear of it. _Ensign_—a silver foul anchor.