Background information Edit
This character was only mentioned in dialogue.
Commodore Probert's name was an inside reference to Andrew Probert, one of the illustrators who worked on the film and, later, the designer of the USS Enterprise-D. (Star Trek Encyclopedia (4th ed., vol. 2, p. 181))
Andrew Probert himself recalled, "The communications station "Epsilon-9" was briefly looked at but the design and building went to John Dykstra's Apogee group. I had a second brush with that station however, when Trumbull asked me to write some appropriate dialogue to run over scenes of the station as background chatter. This introduced the station without a big sign hanging on it. I wrote several levels of dialogue and even stuck my own name in a lower level, but when Trumbull saw it, he had that level moved to the top, and you can hear a message from Commodore Probert if you listen closely." (Starlog photo guidebook Special Effects, vol. 5, p. 96)