Final answer:
The U.S. President is the Commander in Chief of the U.S. military forces, as specified in Section 2 of the U.S. Constitution.
Step-by-step explanation:
According to the U.S. Constitution, specifically Section 2, the U.S. President has the power to be Commander in Chief of the Army and Navy of the United States, and of the Militia of the several States when they are called into the actual Service of the United States. This role places the President at the highest command of the military forces, reinforcing the principle of civilian control over the military. Although the President has this power, Congress can limit the President's military authority by controlling funding and declarations of war, and the President must work with the Senate on matters such as treaties and appointments.