Dallas wrote:
This came up in another group and no one had an answer.

What is the relationship of the FAA to the military? Is the FAA the final
word on regulations for everything in the US airspace with the military
using an additional set of their own regulations?

The FAA is responsible for Civil Aviation. The military and the
government (called public) aviation is not subservient to them.
They cooperate only as it suits their interest.