Giotto

Lieutenant Commander Giotto was the security chief of the Federation starship Enterprise in the 2267.

On stardate 3196, Giotto and a team of eight security officers assisted Captain James T. Kirk and Commander Spock in searching for the mother Horta on Janus VI. (TOS: "The Devil in the Dark")

Giotto was played by actor Barry Russo, who would go on to play Commodore Robert Wesley in TOS: "The Ultimate Computer". In a common mistake made on costume insignia during TOS Season 1, Giotto was referred to as "lieutenant commander," yet wore the braid of a full commander. This mistake was also made on Spock and Ben Finney's uniforms.