I remember when I worked in an auto-industry factory (as part of my training) in Japan, we wore caps with colored bands that denoted rank/category. New employees were dark blue. Equipment/facility maintenance people wore yellow bands. "Management" inside the factory, as well as the white-collar employees had light blue. Outside guests wore red.

Amidst this, workers with disabilities wore caps with green bands. Many were hearing impaired, but there were some with leg issues and others with some form of mental illnesses.

This kind of categorization perhaps wouldn't fly in the States, but it seemed to aid the company's goal of having 5% of their factory workforce composed of people with various forms of disability (iirc).

As knowledge workers, it's easy for us to dismiss bluecollar positions like these, but working at a enormous Toyota group company, receiving a great deal of training and a respectable wage (you can make quite a bit with overtime), and being part of something that produces countless goods into the world is a pretty good deal for people in a country where it's not illegal for potential employers to ask about your existing medical conditions during the interview process.