Final answer:
The U.S. Constitution designates the president as Head of State and Commander-in-Chief of the Armed Forces, but not as Prime Minister or Chief Justice.
Step-by-step explanation:
According to the U.S. Constitution, the president holds several titles which reflect the roles and responsibilities undertaken by this office. One of these titles is Head of State, signifying the president's role as the symbolic representative of the United States both nationally and internationally. Moreover, the president is also referred to as the Commander-in-Chief of the United States Armed Forces, highlighting the president's supreme command over the military forces of the country. However, the president is not the Prime Minister, as this title is not used in the U.S. Constitution, and the president is not the Chief Justice, which is a role that leads the judicial branch of the United States, specifically the U.S. Supreme Court.