Final answer:
The Secretary of Defense oversees the readiness of the Army and the governance of the H₂F system, ensuring all military branches are prepared for their missions.
Step-by-step explanation:
The Secretary of Defense is responsible for the readiness of the Army and the overall governance of the H₂F (Holistic Health and Fitness) system within the U.S. military.
This role involves overseeing not only the Army but all branches of the U.S. armed forces, including the Navy, Marine Corps, and Air Force.
The Secretary of Defense works with military leadership to ensure that service members are physically and mentally prepared to meet their missions and that the forces are well-equipped and trained to defend the nation.