The distinction between voluntary involvement and enforced quotas is a very important one. Though well-intentioned, the introduction of quotas can lead to accusations of tokenism, and create resentment and tension amongst the workforce - in particular given the implication that positive discrimination in favour of one group will inevitably result in negative discrimination against another.
Once my Dad also was on shift whilst I was flying back from New York, which meant that for a short period of time, he was directing the aircraft that I was currently flying over the Atlantic in. When he told me later that he had done so I was amazed, but he didn't seem to think that it was much of a big deal.