Mercenary

Overview
The Mercenary is a soldier that can be spawned by a player who has an mercenary spawner. It attacks the nearest zombie. When it spawns, it will parachute down towards it's spawner. Also, you will have to wait 60 seconds for you to be able to spawn it again. It can also regenerate health slowly. You can only spawn 1 of them, spawning another one while one is already dispatched will regenerate a different mercenary.

You can buy the spawner at the left of your base on the 3rd floor. Although buying the spawner will create stairs to the ground so the mercenary can walk down and attack the zombies which can let some zombies use it. The spawner cost $480K and can be unlocked after buying Weapon's Lab.

Mercenaries can be upgraded to have increased health, melee damage, gun damage and backup/stopping range.

Trivia

 * When you spectate the Mercenary on a vehicle and then unspectate, zooming in will cause the player to zoom into themselves instead of the vehicle.
 * The Mercenary used to only wield an Assault Rifle and a Knife, this was later changed during the Helicopter update.