What is the rank insignia for an O-4 in the Navy or Marines?

The rank insignia for an O-4, which represents the rank of Lieutenant Commander in the Navy and Major in the Marine Corps, is a Gold Oak Leaf. This symbol signifies a mid-level officer position within the naval ranks, highlighting a progression in responsibility and leadership compared to lower ranks.

The Gold Oak Leaf is a widely recognized insignia worn on the uniform, and its distinct design sets it apart from other ranks. Understanding this insignia is crucial for recognizing and distinguishing the various ranks within the Navy and Marine Corps hierarchy, as each rank holds specific duties and levels of authority. The use of a leaf motif often represents growth and the responsibilities that come with increased rank.