The President is both the head of state and head of government of the United States of America, and Commander-in-Chief of the armed forces. Under Article II of the Constitution, the President is responsible for the execution and enforcement of the laws created by Congress.
You can join some branches of the United States military at the age of 38 years but not others. The Army, Navy, Air Force, Marine Corps and Coast Guard each has its own minimum and maximum age requirements for enlistees, including for new recruits in the active-duty ranks, the Reserves and the National Guard.
Types of Service. 1  The Military is comprised of 12 branches: five Active Duty and seven part-time duty. 2  Active-duty service members are full-time members of the Military. 3  They are employed either domestically or overseas.o problem. In this section, you'll find a brief overview of each Service branch, the differences between full-time and part-time duty and links to complete information on each Service. 1  Overview. 2  Army. 3  Marine Corps. 4  Air Force. 5  Coast Guard.