What is one of the key responsibilities of the Secretary of Defense?

The Secretary of Defense plays a crucial role in the U.S. government by advising the President on military matters. This position is part of the President's Cabinet and is responsible for the formulation and execution of defense policy. The Secretary oversees the Department of Defense, coordinates the armed forces, and ensures military readiness and effectiveness. Providing counsel to the President on issues of national security and military strategy is vital, especially during times of conflict or international tension.

In contrast, managing healthcare policy, overseeing the Department of Justice, or regulating financial markets falls under the responsibilities of different departments or positions within the government and are not related to the functions of the Secretary of Defense. These roles require expertise in their respective fields, illustrating the specific focus of the Secretary of Defense on military affairs and national security.