Who is responsible for overseeing the U.S. Navy's operations?

The Chief of Naval Operations (CNO) is the senior military officer in the Navy and is responsible for overseeing all naval operations. This position plays a crucial role in the strategic and operational planning of the Navy, ensuring that naval forces are ready and capable to execute their missions. The CNO advises the Secretary of the Navy and serves as a key member in discussions regarding the overall direction and policies of the Navy.

While the Secretary of Defense and the President of the United States hold significant positions concerning military oversight, they are not exclusively responsible for the specific operations of the Navy. The Secretary of Defense oversees all branches of the military, while the President, as the Commander-in-Chief, has the ultimate authority but does not manage day-to-day operations. Additionally, the Commandant of the Marine Corps oversees the Marine Corps specifically, and their responsibilities do not extend to the Navy's operations. Thus, the Chief of Naval Operations is the correct answer as they directly manage the Navy's operational activities.