If I had to guess, assuming the bureaucracy and processes are no more streamlined than when I was a Navy IT working with the Navy/Marine Corps Intranet at the turn of the century, it may have to do with the fact that some approved devices are allowed, so there would need to be a management and administration infrastructure, including both software, databases and people, for handling every mil computer world-wide. It was probably much easier, faster and cheaper to just put in the info pop up at login and let each local facility handle the enforcement.
ApK
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