If they converted to IPv6, they could easily have a globally unique address space. Real globally unique, not probabilistic.
The fact that the network concentrator co uses DoD v4 address space to avoid conflicts implies that their clients are bringing v4 addresses, so IPv6 is utterly irrelevant in this situation.
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The fact that the network concentrator co uses DoD v4 address space to avoid conflicts implies that their clients are bringing v4 addresses, so IPv6 is utterly irrelevant in this situation.