Which rank has a collar device of a silver eagle?

The rank that features a collar device of a silver eagle is the rank of Captain. In the U.S. Navy, a Captain is an officer at the O-6 level. The silver eagle insignia symbolizes authority and leadership, which are key characteristics associated with this rank. The insignia distinguishes a Captain from other ranks and signifies their level of responsibility and command within the Navy's hierarchy. It's important to understand the visual identity of ranks as it plays a critical role in military protocol and the chain of command.