Juan Cordova
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Ensign Juan Cordova was a Starfleet security officer assigned to the USS Enterprise in the 2260s.
In 2269, he accompanied David Steinberg and Zar on a mission to the planet Gateway, to evacuate the archaeologists from the threat of a Romulan attack. Unfortunately, Cordova was killed by a Romulan soldier. (TOS novel: Yesterday's Son)
