guardsman

noun4

1. •
   A person, especially a soldier, who is on guard; especially, a masculine one.
2. •
   A member of the Guards or of the Guard (in any sense thereof); especially, a masculine one.
3. •
   (US) A member of the National Guard; especially, a masculine one.
4. •
   (UK) A member of a Guards regiment; especially, a masculine one.