Juan Casas was a member of Admiral Harry Morrow's command team at Starfleet Command, San Francisco, Earth and was assigned as a security officer to the USS Grissom (NCC-638) in 2285. (Star Trek: Grissom) Casas was among those killed when the Grissom was destroyed in 2285 by a Klingon Bird-of-Prey (Star Trek III: The Search for Spock)