Lieutenant Gaetano was a male Human Starfleet officer in the 23rd century. He served in the command division aboard the USS Enterprise in 2267 under the command of Captain James T. Kirk, during the historic five-year mission. He was one of the ship's radiation specialists.
That same year, he was aboard the shuttlecraft Galileo assisting in collecting data on the Murasaki Effect. Gaetano was killed by the inhabitants of the planet Taurus II, following the shuttle's crash there. (TOS: "The Galileo Seven")