Chiefs of Staves, surely
Rep. Kinzinger (R-IL) on CNN calling for an independent investigation "an outside group", "outside of politics".
Some sort of bureau. A federal bureau, perhaps. Maybe one tasked with investigating?
I'm certainly not saying that this is the only way or the best way for everyone or anyone to get free from trauma and pain, but I do find this to be a stunning example of empowerment that has given me a lot to think about in the context of my personal and professional experiences.