Constitution-class Federation starship, registry no. NCC-1709, commanded by Commodore Robert Wesley.
Lt. Whatley transferred from the Lexington to the U.S.S. Enterprise a week before the tribble incident at K-7. A few months later it served as the flagship of four vessels involved in the disastrous M-5 wargames, during which 53 crew members were killed.
References: Trials and Tribble-ations