As Commander in Chief, the President of the United States has several responsibilities related to the military and national security. Here are some of the key things the President does in this role:

• Direct the military: The President is authorized to direct the movements of the naval and military forces placed by law at their command, and to employ them in the manner they deem necessary.

• Make military decisions: The President has the power to make decisions related to military strategy, tactics, and operations.

• Appoint military leaders: The President appoints the top military leaders, including the Secretary of Defense, the Chairman of the Joint Chiefs of Staff, and the commanders of the various military branches.

• Declare war: While the Constitution gives Congress the power to declare war, the President has the authority to use military force to defend the country without a formal declaration of war.

• Respond to emergencies: The President can use the military to respond to emergencies, such as natural disasters or terrorist attacks.

• Negotiate treaties: The President can negotiate treaties related to national security and defense, subject to Senate approval.

Overall, the Presidents role as Commander in Chief is to ensure the safety and security of the United States and its citizens, and to make decisions related to the military and national security.