What collar device is used for an O-3 in the Navy?

The collar device used for an O-3 in the Navy is characterized by two attached silver bars. An officer at the O-3 pay grade is referred to as a Captain in the Navy, and this insignia signifies that rank clearly and effectively. The two silver bars represent the level of responsibility and authority held by an officer at that rank, distinguishing them from lower ranks who have less complex insignia.

Other choices represent different ranks: a single gold bar corresponds to an O-1 rank (Ensign), while a single silver bar pertains to an O-2 rank (Lieutenant Junior Grade). The silver oak leaf is used for the O-5 rank (Commander). Thus, the specific design of two attached silver bars as a rank insignia is fundamental to correctly identifying the O-3 rank in the Navy.