"No mourners, no funerals, comrades"
Leo didn't survive the "Shanghai" district of Moscow easily. He was orphaned at a young age in a mugging, instead being raised by his rough uncle. His only friend in his younger years was his cousin. They looked out for each other, and each one felt they owed the other their lives. At 17, Leo's cousin was killed during a break in at the small re-purposed garage they called a home. He died trying to attack the gunman threatening Leo. Leo ran to his best friend and felt the cold skin, a feeling he could never really shake. His Uncle took to the bottle hard after that, and Leo found himself joining the military to get away.
He began training just as the soldiers were being sent to Syria to assist with the civil war. The quietest one of his cycle, it earned him a few nicknames. Early on, one of the other recruits grabbed his arm to try and get a reaction, earning him a bloody nose. Every time he felt skin it always felt like his dead cousin. He spent the next 10 minutes vomiting by a tree before going back to his sleeping bag. He only talked to the handful of recruits he respected, and he came out of training feeling ready for whatever they threw at him. He was assigned to a unit and trained to be the squads reconnaissance specialist. His unit was sent to Syria for 6 months to aid in the war, before being brought back to the escalating tension with Chernarus.
Leo's unit was on rotation as security in the capital when shit finally reached a head. It took a while, but eventually the chaos and confusion led to a collapse. Leo and some others found themselves travelling the city's metro, helping who they could. Leo met his daughter in the metro, a young girl whose parents were lost on the streets above. He searched for them for her for days, even after his comrades started refusing going to the surface with him. He cared for her and the rest of the group with everything he could as they headed south away from the city. Eventually, they found themselves in South Zagoria, hoping for less bandits and infected and more people willing to survive together.