Storyline: It seems we have lost contact with a Police team that were protecting the transfer of UN Special Force weapons. About half way through, they were hit by a major snow storm. This storm caused them to stop, and move the weapons to a near by cave. But it seems a small group of Terrorists were following this cargo, and attacked. They quickly overpowered and killed the team, and then the driver. They are known only as the Arch Angels, said to bring the holy war to the earth, any way they can. They see this way as starting WW3. These are not a normal group, for they have weapons, a team, and what seems to be a leader.
Search the cave, kill the Angels and then stop them from entering the subway, or follow them in...