The NSA does it’s work through the same companies that are known leaders in the field. If you are working on something with national security implications, the NSA or its counterpart in other countries will knock on your door and put your people and your organization under the burden of secrecy and cooperation as a condition of your continuing research and in some cases existence.

That is how the NSC/MIC works, it’s mostly outsourced. The government per se does very little research with some notable exceptions.