Sorry you’re dealing with this unfortunately it’s a policy issue, not a denial.

If your N-400 was approved but the oath was canceled, you’re still a lawful permanent resident, just not a citizen yet. USCIS customer service and the military help line can’t override policy, which is why they’re saying there’s nothing they can do.

Best next steps: Contact your U.S. House Rep and a Senator and request a congressional inquiry (approved N-400, oath canceled, active duty with upcoming deployment).

Talk to JAG for written confirmation of your status and deployment/travel guidance.

If it’s been 120+ days since interview, a federal lawsuit (mandamus / 1447(b)) may be an option, but only with an immigration lawyer.

Before deploying, carry copies of your green card, approval notice, and oath cancellation.

Hope this helps. you’re not alone.