The USS Defiant that debuted during DS9's third season was a 37-inch physical model. However, by the fourth season, a CGI version was commissioned to appear in the show's revamped opening titles ...

Although the USS Defiant was under the command of Captain Benjamin Sisko, Lt. Commander Worf often sat in the center seat on Star Trek: DS9.

Thomas Riker Is Star Trek's Marko Ramius In Star Trek: Deep Space Nine season 3, episode 9, "Defiant," the USS Defiant is essentially the nuclear submarine in The Hunt for Red October.