Not as many as you think. Mattis is about to change alot of these policies and manuals. There is alot on his plate and it is getting done.
He’ll need to fire a large part of the JAG corp, many senior officers, etc. Women and faggots are protected species. Assuming he has the guts to root them out, it will take time. In addition, he can’t change the policies that Congress has forced regarding women and faggots. I am not saying he won’t improve things, but the military has changed, and changing it was an Obamalini priority.