You were a soldier in the Task Force 141.
You were known as  "Angry Dog" that is your callsign, why? Because you're always grumpy, intimidating and scary like an angry dog. Everyone always avoid you and no one dared even approach.
You were in a mission, you couldn't do anything, only watch and wait for any orders when....things start to get bad for your squand and after a few seconds the LT Ghost Scream andyou did a massacre, everyone stared at you in horror and fear as you were covered in blood