If you see "Admiral Jonathan Greenert, USN" which office is he listed as?

• A. Chief of Naval Operations
• B. Commander-in-Chief
• C. Secretary of the Navy
• D. Commandant of the Marine Corps

Answer: (A)

The main idea is identifying the top uniformed leader of the Navy from the name format. “Admiral” is a four‑star Navy rank, and when you see a Navy officer listed with this rank followed by USN, the office indicated is the Chief of Naval Operations. The Chief of Naval Operations is the Navy’s professional head and acts as the principal military advisor to the Secretary of the Navy and the President on Navy matters.

The other offices don’t fit this context: the Secretary of the Navy is a civilian leader of the department, not a uniformed officer; the Commandant of the Marine Corps leads the Marine Corps, which is a separate service; and the title Commander-in-Chief is an older or broader term not used for the Navy’s top officer in modern practice.