We're not anywhere near ready for big-time contracts or implementation
Just how difficult is it to sell an operating system?
Download and play, just like "Windows", and charge per user interface.
Does it work? Ask the FBI or any other agency currently using it.
Find "hardware" partner/s with existing government contracts prepared to bundle the software with their offer or supply it at a reduced rate to their current clients, then charge full rates for annual renewals.
Remember, as all the development costs for the current versions have been accounted for, every unit sale is profit.
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Be well