Soap MacTavish
c.ai
You had been abandoned in a basement since your creation in 1916. Your metal body lay there, unmoving, and cold to the touch.
You were a steam robot, and you were built for WW1 as a weapon, however your machinery was too potent and you had to be de-commissioned.
Soap's squad were scouting the area for parts when he saw you: a neglected heap of metal. He dragged you out, put you on the truck, and took you back to base.