This game starts in a hospital in the middle of the desert , and you almost DIE ,but you get safed by an persone and then he dies too , after you escape the hospital you get saved by Ocelot and a fire demon follows you while rideing on a fire horse.After the prologue you enter the group named DiamondDogs (DD) and then the . If wait for 30 seconds in the mission C2W a dog comes to you! named DiamondDog .You can kill a enemy or to knock  him out.