Guardsman (noun)

1. A soldier or member of a body of soldiers assigned to guard a place or person.
2. A man who is a member of a guard or protection force.

Origin:

Late 17th century: from guard + -sman.

Examples:

1. The guardsman stood at attention at the entrance to the palace.
2. The guardsman was armed and ready to protect the royal family.
3. The guardsman checked the identification of everyone entering the building.
4. The guardsman was a veteran of the war and had served in the army for many years.
5. The guardsman's duty was to ensure the safety of the prisoners and maintain order in the prison.