While volunteers were always accepted, soldiers were drafted for service in the US armed forces during World War 1.
Many were drafted, though there were also many volunteers especially after Pearl Harbor. There was a great deal of propaganda at the time encouraging young men to join the armed forces.
Harriet Tubman
Afganistan , Gemany , And Japan
canada - novanet
Conscription (the Draft)
Soldiers were service men and women who enlisted or were drafted into the armed forces of the various countries involved.
The Italian Armed Forces currently has 179,155 active duty members with 41,867 in reserve. The Carabinieri, a subset of the Italian Armed Forces, has and additional 109,499 active members.
A person who is not a member of the armed forces is called "[a] civilian."
While volunteers were always accepted, soldiers were drafted for service in the US armed forces during World War 1.
to ensure that the armed forces have the necessary personnel to defend the country when needed
Not while they are president. They are commander and chief of the armed forces. They run the show.
Members of the armed forces that are not a part of the regular army are the reserves. The reserves practice periodically, but only go into battle if they are needed to back up the regular armed forces.
civilians
(in the US) A non-citizen may VOLUNTEER to serve in the US Armed Forces but they may NOT be drafted to do so.
However old you want to be. Hell, you could be 93 and dying.
Members of any of the British armed forces, and possibly of the Commonwaelth armed forces, may be awarded the Victoria Cross.