Lieutenant Baeta Leyoro was an Angosian Starfleet officer who served as the security chief aboard the Federation starship USS Enterprise-E in the year 2374. (TNG - The Q Continuum novels: Q-Space, Q-Zone, Q-Strike)
During her youth, Leyoro fought in the Tarsian War, enduring psychological and biochemical conditioning to increase her fighting skills. After the war, she left Angosia III and joined Starfleet. At some point she had her enhancements removed by her people and been reconditioned so as to rejoin society. However she still retained several enhancements.
Leyoro served aboard the USS Jefferson and the USS Olympic and eventually reached the rank of lieutenant. The Angosian held an exemplary record, in her service she possessed a colorful and faintly notorious history. In her career she smuggled defectors across the Neutral Zone in an uncloaked ship, rescued political prisoners from a maximum-security Tarsian slave labor camp, and even repelled a Maquis raid with nothing more than a single shuttlecraft and a malfunctioning photon torpedo.
Leyoro served as Worf’s replacement during his transfer on Deep Space 9. During Dr.Fal’sexperilent to pierce the Galactic Barrier she was introduced to Q. And his family. Almost immediately she took a dislike for the immortals did to their blatant disregard for mortals. She wished to take aggressive measures against Q but was restrained by Picard. Q compared Leyoro almost to the deceased Natasha Yar.