What is the correct term for Navy O-4?

The term for Navy O-4 is Lieutenant Commander. This ranks above O-3, which is a Lieutenant, and below O-5, which is a Commander. The role typically involves leadership responsibilities and often includes managing divisions or departments within a ship or shore command. A Lieutenant Commander may also serve as an executive officer on smaller vessels or in certain capacities within larger fleets.

In the Navy, each rank carries specific duties and responsibilities that are crucial to maintaining effective operations. Understanding these ranks helps in recognizing the hierarchy and structure within naval operations, which is vital for effective communication and leadership in various scenarios. The other options represent different ranks: a Commander is O-5, Captain is O-6, and Rear Admiral is O-7, each illustrating a higher level of command and broader responsibilities than that of a Lieutenant Commander.