William Michaud is a Warrant Officer for the Royal Canadian Air Force, serving since 2009. Michaud has been off duty since 2015, and has since dyed his hair and became a commercial co-pilot for Air Canada. On his way to Shanghai, Michaud's pilot decided to land in an airfield in Chernarus to refuel. Unfortunately, as the plane was fueling all air traffic was grounded. Days passed, and Michaud decided to slip past security and fend for himself.
The next day, Michaud took shelter in a tool shed from a storm as explosions were heard all throughout the night. Inside the shed, he found an unlocked gun case containing a Colt 1911 and a box of 10 rounds. Michaud didn't know exactly what was going on, but he knew it was bad. Outside he could hear screams and almost-inhuman screeches. He creaked the shed door open, but the noise was so great, a nearby person turned and looked at him. Michaud would never forget the face of whatever thing was staring back at him. It charged him, and in the panic, he froze. It clawed at his arm and Michaud grabbed the gun from off the floor and shot that thing square in its temple.
Michaud was bleeding bad. He burst into the house that owned the shed and begged its occupants for any sort of bandages. The family took one look at his arm, and the father told Michaud that he was going to become one of those things soon. Michaud took a moment to process. He rationalised that they may be right, but he would for sure die of blood loss. He brandished his firearm, walked into the bathroom, and stole a pack of gauze from the medicine cabinet. He thanked the family for the bandage and information, profusely apologised for using force but cited that "desperate times call for desperate measures", handed the father the gun to protect his family, and walked out the door. He grabbed a hatchet from the tool shed and hid in there for the rest of the night.
Michaud had seen a woman get scratched by those things, fall to the floor, and a few minutes later get back up and start screaming. He figured that if he had survived this long that he either got extremely lucky, or was somehow immune to this virus.
Today, Michaud is attempting to find any sort of military, NATO, or UN installation and contribute his Air Force expertise in any way he can.