Who is responsible for the command of the entire U.S. Navy?

The Chief of Naval Operations (CNO) is responsible for the command of the entire U.S. Navy, acting as the highest-ranking officer in the Navy and a key military advisor to the President and the Secretary of Defense. The CNO oversees naval operations, sets strategic direction, and ensures the readiness of naval forces to execute national defense goals. This position involves managing personnel, budget, and operational capabilities, establishing policies and programs that guide the Navy's mission and objectives.

The other roles, while significant, have different levels of authority and responsibility. For instance, the President serves as the Commander-in-Chief of the armed forces, which includes the Navy, but delegates command authority to military officers for operational aspects. The Secretary of Defense is responsible for the overall defense policy and oversees all branches of the military but does not command the Navy directly. The Fleet Commander is responsible for specific naval fleets and operational command but is not in charge of the entire Navy structure. Thus, the CNO is the correct answer regarding the leadership of the Navy.