Mosi Nizhoni

Nizhoni was a female human of Navajo ethnicity in Starfleet in the 23rd century. As of 2274, she held the rank of Ensign, and served as a security and tactical officer, second in command to Chief of Security Pavel Chekov, aboard the USS Enterprise. (TOS novel: Ex Machina)

By 2282, Nizhoni had reached the rank of Lieutenant Commander, and served as chief of security aboard the USS Reliant under Captain Clark Terrell. (TOS eBook: Mere Anarchy: The Darkness Drops Again)