What is the main duty of the President as Commander-in-Chief?

The main duty of the President as Commander-in-Chief is to oversee the military forces. This role gives the President the authority to direct military operations, make strategic decisions regarding national defense, and ensure the preparedness of the armed forces. As Commander-in-Chief, the President has ultimate responsibility for the national defense and can make critical decisions regarding the deployment of troops and the use of military force, reflecting the balance of power established in the U.S. Constitution between civilian leadership and military authority.

The other options, while important roles of the President, do not directly relate to the Commander-in-Chief duties. Enacting laws is primarily the responsibility of Congress, managing foreign relations is typically coordinated with the Secretary of State and involves diplomatic efforts, and appointing justices is a separate function related to judicial appointments that requires Senate confirmation. Thus, the authority and responsibilities associated with the role of Commander-in-Chief are specifically about military oversight.