Except the guy on the right. Eventually to become Commodore Bob Wesley (The Ultimate Computer 1968) - (depending upon when the episodes were released; not sure if this was before or after The Ultimate Computer). Update: OK “The Ultimate Computer” was after “Devil in the Dark”.
Looks like that pic might be from “Devil in the Dark” (Lieutenant Commander Giotto) which was the previous year, 1967. (I am now checking on Barry Russo’s IMDB page).
Barry Russo went from Lieutenant Commander to Commodore in just one year!