USS Sentinel
The USS Sentinel was a 24th century Federation starship operated by Starfleet.

While visiting Deep Space 9 during the Dominion War in 2375, the Sentinel listed a surplus graviton stabilizer on its manifest. Nog, acting on behalf of Chief O'Brien who needed the stabilizer for the , secured the unit in a complicated trade that brought a phaser emitter from the . ()

Apocrypha 
The starship class of the Sentinel was not known, but the games Star Trek: Invasion and Star Trek: Armada portray it as a  starship, while Pocket Books' Star Trek: SCE, War Stories, Book I stated the starship belonged to the  with the registry NCC-68455 and that Lieutenant Commander Sonya Gomez served aboard the vessel during the Dominion War as chief engineer.

In the Star Trek: Starfleet Academy game (set in the TOS film era), the Sentinel was a  starship and crossed the Klingon neutral zone without authorization and engaged two Klingon Birds-of-Prey after it was believed that the Klingons were responsible for the mysterious destruction of a Federation colony.

Sentinel, USS