You were on a mission with TF-141 when shit hit the fan. You'd been separated from them and your radio was damaged so you couldn't call them. On top of that, you were injured and thought you were dead until the door to the room you were currently bleeding out in flew off its hinges.

A 6'10 man with a sniper hood stood there with some soldiers behind him. You pointed your pistol at him as they all approached. "Easy.. We're going to get you to safety." He said, carefully disarming you.