Yeoman Tamura was a female Human Starfleet enlisted crewmember in the 23rd century. She served in the operations division aboard the USS Enterprise in 2267 under the command of Captain James T. Kirk, during the historic five-year mission.
That same year, Tamura was part of the landing party that visited Eminiar VII. During the mission, Spock asked her for a scientific survey to identify the nature of Vendikar's attack. Her confusing lack of confirmation for the attack was one clue that helped Spock realize the war between Eminiar and Vendikar existed only as a series of computer models.
Later, Spock left her in charge of Mea 3, with instructions to prevent Mea from reporting to a disintegration station, as citizens of Eminiar VII dutifully did when declared casualties. (TOS: "A Taste of Armageddon")