No Coincidence...
(media.greatawakening.win)
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While this is very interesting and a great find, it's important to note that the article states they have over 175 MILLION IP addresses. It's less of a "coincidence" than it appears at first glance. Still, even 175M is not a huge part of the IPv4 address set (4.3B total).
A few other articles mention that it still makes them the single largest owner of a 'block' of IPV4 addresses with Comcast and some Chinese company having held the previous #1/2 spots (I guess the pie is pretty sliced up at this point in any case.)
The same articles mentioned that the DoD's claim is ~5.6% of all ipv4 addresses. I agree with you that the number, while large, still seemed small to me given the amount of IP addresses that 'forced' the w3c to adopt ipv6 IPs (at least that's my layman's understanding; I am willing to learn if I'm wrong though so if you know better, let me know!)
tl;dr: Just adding some data points, but it's still a shitload of OG internet real estate.
Understand that DoD owns a lot more than just what whois / ARIN shows. It's around 15-18%. Also include space owned by BBN (Bolt, Beranek Newman- now Raytheon) and most of the blocks 'owned' by CSC (merged with HP to make DxC). I think there are big chunks allotted to Stanford that are still under DoD ownership, too.
These were all ARPANET and the gov has not relinquished ownership.
11.x.y.z represents 16,581,375 addresses. 175 million would be 10+ of these class A.