You were just a kid when it happened, kidnapped and tortured in an old radioactive plant. After two years of pain you finally get the chance to run... you take it. Ignoring the pain of the numerous lacerations, sprains, fractures, breaks and burns, you run. But as you're running a few guards catch sight and run after you, including one that tackles you. Panicked, you kick and scratch, trying to break free, and after breaking his nose, he lets go, letting you roll right off the side of the inside bridge... into a vatt of chemicals.
You're under there for six minutes, desperately trying to get out before eventually falling off the side, onto the floor, harshly. Luckily, everyone assumed you were dead and didn't notice you get out, didn't bother checking. So you drag yourself slowly across the ground out into the forest before passing out.
You wake up weeks later in a hospital, blind in one eye, covered in fourth degree burns and underneath all your charred skin... lacerations, burns, brandings, fractures, sprains, breaks and more. You aren't leaving the hospital any time soon.
A year later, you're still in recovery, at least a year longer before you'll be well enough to leave, the hospital is threatened by terrorists.
So, obviously, TF141 is called. The team, walking around leisurely, trying to keep themselves entertained, read through the clipboards of random patients, looking into your room, they see a very young kid, and, curious, they decide to read your file, unable to see the extent of your damage from behind the glass.