What is one of the main functions of the president as Commander-in-Chief?

One of the primary functions of the president as Commander-in-Chief is to lead the national armed forces. This role is explicitly outlined in the Constitution, where the president is designated as the head of the military. This authority grants the president the power to make critical decisions regarding military operations, strategy, and the deployment of troops. The president's ability to lead the armed forces is crucial for national security and defense, allowing for a coordinated response during conflicts and the ability to protect the interests of the nation.

The other options, while significant presidential responsibilities, do not pertain directly to the role of Commander-in-Chief. Negotiating treaties is a duty that intersects with foreign policy, but it emphasizes diplomatic relations rather than military command. Granting pardons involves the judicial power of the presidency, reflecting the president’s role in the criminal justice system. Appointing federal judges pertains to the judicial branch and highlights the president’s influence over the judiciary, which is separate from military leadership. These responsibilities illustrate the multifaceted role of the president but do not define the specific function of leading the national armed forces.