Mac and his two brothers grew up in what he saw as a messed up family. Marty became an asshole, and Marvin became a stick up, but Mac became neither. Being born a little earlier than his two brothers, he took all the brute, but took the respect of his father. He was more mature, knew more, and had initiative all of the time. He defended his brothers against ruthless people, but showed them how to become ruthless. He beat and hurt Marvin, the youngest brother, so that he can learn to be ruthless. It never happened to Marvin, but Mac was more of a father than a brother to his siblings. After high school he joined the USMC as an 0372, or MARSOC Marine Raider. After being an operator for 8 years and 3 tours in Iraq, and 2 in Afghanistan, he commissioned as a Warrant Officer. He became an EOD specialist within MARSOC and knew a lot about explosives. As a CWO (W-3), he was sent to help the revolution efforts of the democratic side in Chernarus. When, the infection started, well he just went off the grid. The rest of the story is right there, within the Country, right now.