What is the collar device for a Navy O-3, Lieutenant?

The collar device for a Navy O-3, which is the rank of Lieutenant, is accurately represented by two silver bars. This insignia is used to denote the rank clearly and is recognized across various naval and military environments. The use of two silver bars is distinct and differentiates a Lieutenant from other ranks, such as Ensign (O-1) which uses one silver bar, and Lieutenant Commander (O-4) which uses a gold oak leaf. This system of collar devices helps maintain a clear hierarchy and ensures that personnel can quickly identify ranks, which is crucial for operational efficiency and respect within the naval forces.