Military potential is true for all materiel. Including DoD satellites.
> We will end up with a graveyard in space where fragments will make it difficult to continue any space activities
No, we won’t. Specific orbits will get trashed. And even then, only for a few years—LEO deörbits in months to years, the latter only for small things in high LEO.
Nope. All major militaries have had dedicated satcom for decades.