The movie was called The Challenge (1970). A US marine vs. a Japanese soldier fighting it out to the death on an island.
An African American soldier on the frontier is called a Buffalo Soldier.
Ten strangers were invited to Soldier Island in Agatha Christie's "And Then There Were None." Their host, Mr. U.N. Owen, was mysteriously absent.
A down under soldier is called an anzac.
A soldier in the U. S. Army who fights with a rifle is called a weaponeer. A U.S. Marine is called a rifleman.
A foot soldier was commonly referred to as an infantryman or simply a soldier.
A person who goes to war is called a soldier. They may be a volunteer or a draftee, but they are still a soldier.
A mounted soldier is called a knight. It begins with the letter k.
German Soldier or an Waffen SS Soldier.
Absent Without Leave
Citizen-soldier
A Spanish soldier is called a Red Coat