Pizza Hut has plenty of locations on military bases, each with a team dedicated to selling their product to the military.

I see your point. To answer your original question, yes Canonical's military relationship is fundamentally different from Pizza Hut. More comparable to something like Palantir that sells SaaS or IaaS

So more like Google, Microsoft, Amazon, Salesforce, and most big tech companies than either Pizza Hut or Raytheon? Perhaps most like Red Hat (who also sell to the DoD)?

I think it would be unusual to call them all military contractors (as you called Canonical in another comment).

Microsoft is the largest contractor of the Department of Defense.

I guess many laypeople have not kept up but to any community organizer or people involved in activism, these companies are certainly thought of as military contractors. An accurate assessment imo.

Ubuntu happily sells support contracts to whoever wants to buy them, yes. You can buy the same product the DoD does, it is not special. There is no "secret ubuntu distro for the DoD" by any stretch of the imagination.

The only thing the DoD cares about when it comes to an OS is that it is STIG'd and supported. RedHat and Canonical make a lot of money via support contracts for DoD programs.

Canonical == RedHat == Microsoft for the point you're trying to make, and that point is incorrect.

I hate ubuntu, in no way am I defending Canonical. If Iran thinks DDoSing Canonical will further a cause of their, it would be a second order effect, not just "because Canonical."