For two, consistent anecdata from personal acquaintances and forum posts. The demographics are also completely changing. The military was until recently carried primarily by white men from small town America. Now white maleness is effectively a career handicap when genitals, skin color, and sexual orientation are considered for promotion.
I think the recent army advertisements are a valid proxy for the negative value that current leadership places on white-maleness. A military which is still majority white and male is releasing recruitment videos which exclusively feature minorities, females, and a healthy sprinkling of homosexuality. Here's a nice illustration, comparing recent US ads to those from Russia and China[0]. Only two of those forces are actually interested in recruiting competent soldiers, if these ads are any indication. China is laughing.
0. https://m.youtube.com/watch?v=Kfe6d6MzeLM
Edit: the sister post by jimmygrapes found one of the reports/letters I was looking for. I urge you all to read it to see, among other things, what happens to morale when demographic considerations are added to promotion evaluations. What is reported is consistent with what I've been hearing from former servicemember acquaintances.