The Mackerel

The Mackerels nickname come from his time in the danish navy seals. He has done tours to both Iraq and Afghanistan, and he likes to entertain the others by telling stories about chasing the Taliban in caves and shooting cows from helicopters and so forth.
The Mackerel claims that he is as sane as ever - guess that's relative - but the others have noticed that he has some strange behaviour. Amongst other things, he has a tendency to unwittingly reach for his rifle whenever he sees a cow and his face tics when words like "cave", "mg" and "buttplug" is mentioned.