The US Military Establishment is well known for cover ups throughout its history. They are a State within a State with their own laws, judiciary process, and their clever
PR.
I do not single out the US. This is true for all countries. It is the nature of the organization---to be secretive, to cover up, to cover its backside.......
Sure 99% of the US Military is honorable and decent and clean.
But the 1% which is dirt tarnishes the image of the whole organization.
It would be naive in my opinion to believe otherwise.
And in a conflict, things get worse ---on both sides. I only say that don't blame the enemy when you do the same.