"Tribunal" is the 25th episode of the second season of Star Trek: Deep Space Nine.
Chief Miles O'Brien and his wife Keiko are scheduled to go on vacation, and as O'Brien hurries along the Promenade on his way to the runabout he nearly drops several PADDs he is carrying. A nearby Human moves to help with the load, but O'Brien reassures him he has it under control. As O'Brien walks away, the man seems to recognize his face but not his name. O'Brien realizes who he has just seen and turns back, recognizing Raymond Boone, one of his former colleagues from the Rutledge. Boone recognizes the name Miles O'Brien immediately and is glad to see him after so long.
Boone says he left Starfleet eight years ago and now resides on the Cardassian side of the Demilitarized Zone. He admits that the new Federation-Cardassian Treaty puts him and his fellow colonists in harm's way, but he says the Cardassians leave him alone since he mines ladarium. O'Brien is surprised and does not understand how Boone could live among the Cardassians after what happened in the Border Wars at the Setlik III massacre. While the incident convinced O'Brien to stay in Starfleet, Boone says it convinced him to leave. The two plan to meet the next time Boone is on the station, but Boone loses his friendly air once O'Brien is gone. Later, Boone enters his quarters carrying a data pad on which he recorded the exchange with O'Brien, and now he sorts through it to find the portion where O'Brien stated his name. "O'Brien! Miles O'Brien," it says...
Did You Know that while Morn's headpiece's mouth was designed to be able to move and talk, and every time it was applied to the actor it was capable of doing so, he never spoke a single word throughout the entire run of Deep Space Nine?