E'swa D'rex was an individual who served aboard the USS Lindberg in the 25th century. In 2401, Ensign D'rex explained publicly why Captain Zachary MacAllister ignored orders from Starfleet Command to go into Gorn space to aid the Gorn against the Klingons. D'rex claimed that MacAllister kept saying the Klingons would attack the Federation when they were done with the Gorn, and they had to stop them before then. (ST website : The Path to 2409)