In several of the photos that I've seen of the factory workers, I've noticed that there appear to be 3 types of uniforms: White (chassis welders ?), Blue-ish Gray (general assembly workers), and a dark blue/black ? Does any one know the significance of this different uniforms/jumpsuits? The best example that I've seen is the photo in the vault of the 1,000th car off the assembly line with the workers around it. -Robert