I have yet to see a credible report of them denying a US government request.

Big big big big difference between "they usually do what we ask" and "we have operational authority over this system, and can court martial anyone that impedes its operation"

Isn't everyone with the root password a US Citizen? Last time I checked SpaceX's job opening, a US clearance was required.

Assuming that the US ever enters any war directly, guess what their first action will be: take Musk out of the picture, deal with the legalities later on.

The legality isn't in question; Defense Production Act very much applies.

Which is partly why the DoD commissioned a second constellation specifically for military use: https://www.spacex.com/starshield/

Wow. Is there any concrete info about the build-out? Or do you think they will just provision X% of existing sats / bandwidth to military use? I recall learning years ago that modern "long lines" (telco) were all pure data lines, where a certain portion was reserved for guaranteed bandwidth required for (voice) telephone calls.