The Starfleet commander-in-chief in Star Trek VI: The Undiscovered Country, addressed as Bill, who chairs the briefing on Praxis and later presents the Operation Retrieve rescue plan to the President.
The officer credited as Rear Admiral William Smillie is Starfleet's commander-in-chief in 2293, played by Leon Russom in Star Trek VI: The Undiscovered Country. On screen he is only ever called Bill or the C-in-C.
He opens the classified briefing at Starfleet Headquarters at which the destruction of Praxis is revealed, and hands the floor to Spock, the Federation's special envoy, who announces the Klingon peace initiative.
After Kirk and McCoy are arrested he comes to the President's office with Admiral Cartwright and Colonel West to propose Operation Retrieve, an armed rescue. The President turns it down. Unlike Cartwright, he is not shown to be part of the conspiracy.