Tress is wheelchair-bound as a result of the way its lower joints and back were built. The alpha batch was the batch that didn’t have a standard model, as diversity of design was useful for figuring out what went best. Its lower “spine”, hips, and knees broke and the scientists decided that since it could still complete missions and a perceived disability made civilians less suspicious, to leave it be.
Tor uses crutches for a similar reason, except it was only the design of her knees, and they only were weakened, not broken. They find the crutches useful when trying to smuggle wires into wherever zer assignment leads.
The Alpha code was never truly designed to last.


















