Specials ops serving in Afghanistan are doing that now. You're probably thinking of a knight, although your description is inaccurate - Knights were not soldiers; they were members of the nobility.
cavalry
Cavalry.
He wears armor, and a crested helmet. He has a shield and spear and rides a chariot. Hope that helps!
The Lone Ranger
In halo he wears mark 1 armor in halo 2 he wears mark 2 armor
Templars
the prince
a sea horse
armadillo
it is a a corporal
Trooper is a man/women who wears a armor and fights in the war.
chainmail armor helmet chest plate gauntlets footwear
Bearcats - 1971 The Devil Wears Armor 1-1 was released on: USA: 16 September 1971 Germany: 17 October 1993
The answer is "knight". The question refers to a common expression, used in sentences such as this: "You're my knight in shining armor!"