OH WAIT I OWE YOU GUYS A BIOGRAPHY
Name: Michael Sloan
Claiming to be a member of the recently-formed "3rd Quarantine Division", he stumbled into the camp, raving and out of his mind. Quantum came over and helped to the bar, where he explained his situation.
One week earlier, he had led his platoon in an offensive against the infection. His primary objectives were to retrieve a number of individuals, and kill certain others. He met the frist objective. However, when he called for air support, it came in too short, killing most of his platoon. Whoever was left was stunned by the blast, and were torn to shreds by the infected. Witnessing this, he fled the front lines, and has been wandering the infected zone since.
He's also displayed a bit of mental instability, I may expand on that.