Is the Nt S B an Independent Agency?

The n t s b has authority if there's an aircraft incident involving a commercial and military aircraft, but their charter is to investigate commercial and private aircraft. And the military investigates heir own incidents. But i would be surprised if there haven't been times that the military has called in the n t s p to actually help understand why some incidents happened. Remember everyone that seabury securities, a specialty finance and investment banking firm boasting a 25 year track record of advising aviation clients around the world.