In reality mercenaries are experienced fighters from all walks of life who offer their services as hired soldiers.
They maybe ex-military soldiers, ex-special forces operators, underground fighters such as elite resistance/guerrilla troops.
Or they maybe notorious terrorists of various nations who offer their services to the highest bidder.
Mercenaries are capable of dealing with virtually any kind of armed resistance using careful tactics, military precision and excellent equipment.
However, since they do not spend much time wandering the Zone like most Stalkers, they lack the extensive knowledge of the Zone that many Stalkers have.
Being professional soldiers, Mercenaries often charge their clients large amounts of money or anything of the same value (artifacts for example).
Mercenaries have been known to be hired by wealthy and powerful corporations to retrieve artifacts and other unique objects in the Zone.
The Mercenaries also prefer to avoid any complications with the Ukrainian government and the military so as to not hinder their movements and connections within the Zone.
They usually avoid all direct combat with the military or otherwise governmental personnel, although if the money is worth the risk some might make exceptions.
Every mercenary group has it's own load out to stand out from the other groups.
Mostly all of them include: