Admiral Richard B. Barnett was a Starfleet officer during the Dominion War.

In 2374, the starship USS Exeter reported Barnett as missing in action. His name was listed in a casualty list that was displayed in the wardroom of Deep Space 9. (DS9: "In the Pale Moonlight", okudagram)

This character was only mentioned in writing.
He was named for production staffer Richard Barnett. It's unknown if he was related to the earlier admiral with that name. (Star Trek Encyclopedia (4th ed., vol. 1, p. 67))
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