The first time i saw the meat soldier outfit in the demo, i immediately came up with an awesome origin story for him It sounds weird but i think it's creative.
So his real name would be Bruce Markov (Cousin of Yuri Markov) who would help Yuri with the experiment on the MEAT. once the meat showed signs of life and begin to break out of the tube, Bruce would tell Yuri to stop the experiment, but Yuri wouldn't listen. The front computer then would explode, and Yuri would leap in front of Bruce to protect him, but Bruce still had his flesh vaporized, but his brain survived. The meat would then cover Bruce eventually and soon become his flesh, But because his brain and neural system was still intact, his brain was now in control of the meat.
Now Bruce is working for the US government to stop the infection (and his Apocalypse bringing cousin)