I never forgot this story from 2018 about a black police officer suing over a requirement to be clean-shaven every day.
> Officers have to be clean cut, except for mustaches or short sideburns. Joseph Lewis, a six-year vet of the force, however, suffered from razor bumps, which made it painful to shave. The condition is common in about 60 percent of African-American men or people with coarse, curly hair, according to the American Osteopathic College of Dermatology.
https://newsone.com/3780050/racial-discrimination-shaving-fa...
It seems the USAF is now issuing these waivers with 5 year terms. [0].
[0]: https://www.airforcetimes.com/news/your-air-force/2020/06/24...
I think the reason why we see these things still happen is because the laws are broad, continually improving, and education is administrated at a local level so you have different organizations rediscovering the same social issues over and over.
The authorities response between the black live matter protests and the terrorism from trump supporters is just one recent example of this. As long as the people discriminating have more power than the ones being discriminated, laws only protect some.