Commander-in-Chief

The Commander-in-Chief is the nominal head of the Galactic Union Military as a whole. Unlike previous interations of the title, the holder does not serve as Head of State, nor even in government. The Commander-in-Chief is a head of one of the military branches of the Galactic Union Military, they are appointed by the President of the Galactic Union. 
Aside from one instance in 2167, every Commander-in-Chief has also been the Chief of Naval Operations, the head of the Galactic Union Navy. 
The current Commander-in-Chief is the 27th Chief of Naval Operations, Fleet Admiral Reginald Williams