Anhalt was a 23rd century Human man, an officer in Starfleet. By the 2260s decade, he had reached the flag officer rank of commodore. In the year 2267, Anhalt gave James T. Kirk permission to destroy the planet Deneva and kill more than one million Denevans in order to control the parasite infestation on that world. (TOS - Star Trek 2 novelization: Operation -- Annihilate!)