Marvel: Spartan

Taken as a child for a project that required the best genes that only a handful of people had, he was put through vigorous training in preparation for his operation which he underwent at the young age of 13, but due to an unseen amount of cosmic radiation, he managed to survive and acquire the benefits of the program with a little extra on the side. But due to the excess radiation, an accident occurred destroying the lab and everyone in it, except for John and an experimental armour. Now free he has to make a life for himself and try to live a normal life, but how is someone like him supposed to do that, and who's this Happy guy and why is he offering me to apprentice under him? Being a bodyguard, you say. Well, that should work.