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.
The Air Force raised the maximum age for enlisted accession from 27 to 39, meaning it may now be the best choice for those who feel the call to military service later in life. The maximum age for Army enlisted recruits is 35, while the Navy and Marines cap recruit ages at 34 and 28, respectively. Under federal law, the oldest recruit any military branch can enlist is 42, although each service sets its own policy within that limit. U.S. Air Force Lt. Gen. David S. Fadok delivers the oath of enlistment to new Air Force enlistees during Military Appreciation night at Riverwalk Stadiumin Montgomery, Ala., June 2, 2012.