I scale some large K8s in fed (not DOD)... ATO is fun. Actually unsure how I'd position something like OPA (actually envisioned them being key back in '17 when working in the Kessel Run relm... called and they hadnt been exposed to fed at the time).
Legit question / maybe dumb - where is DOD at in general perimeter security. Outside looking in & everything before a container runs - network and to OS primarily, cloud envs as well. A lot of Fed needs help here before they can comprehend even a basic Kubernetes authorization. It's also generally more important (at list from controls perspective) in non DOD environments, than something like security context in pods.