They can be called private security guards
A Private.
Private US Army $50 a month
One word would be mercenary.
Soldiers who fight in any country's army for pay are called soldiers of fortune or mercinaries.
A squaddy. .
squaddie
They can be called private security guards
No, it is not mandatory for a soldier to be quartered in a private residence.
They were called Conquistador.
Yes. Private is a rank. So you could call a soldier by his rank or by his rank and name, such as "Private Jones". Not all soldiers would be called "private" unless that is their rank. Others may be called "Sergeant" or "Lieutenant" or "Captain".
buffalo soldier...
They were called Conquistador.
A Mercenary
Neither. "Buck Private" was a slang term for the rank of Private.Once a new soldier was promoted and given 1 stripe, his rank was Private First Class. So, they used this term to distinguish between a Private with no stripes and a PFC.
The New York Yankees. the reason why is the northern soldier during the civil war was called Billy Yankee and the southern soldier was called Johnny Rebel.
Trooper