The Constitution establishes the president as commander in chief of the Army and the Navy. According to the National Security Act of 1947, the president is the commander in chief of all armed forces of the United States, including the Air Force and Space Force.

The President shall be Commander in Chief of the Army and Navy of the United States, and of the Militia of the several States, when called into the actual Service of the United States; he may require the Opinion, in writing, of the principal Officer in each of the executive Departments, upon any Subject relating to the Duties of their respective Offices, and he shall have Power to grant Reprieves and Pardons for Offences against the United States, except in Cases of Impeachment.

The President shall be Commander in Chief of the Army and Navy of the United States, and of the Militia of the several States, when called into the actual Service of the United States; he may require the Opinion, in writing, of the principal Officer in each of the executive Departments, upon any Subject relating to the Duties of their respective Office, and he shall have Power to grant Reprieves and Pardons for Offences against the United States, except in Cases of Impeachment.