Capt. James T. Kirk, commanding officer of the USS Enterprise, NCC-1701, begins a never-completed wedding ceremony for two of his crew in the episode “Balance of Terror.” Capt. Jean-Luc Picard, doing the same thing in the Star Trek: The Next Generation episode “Data’s Day,” uses almost identical words, as does Adm. William Ross in a Star Trek: Deep Space Nine episode, and Capt. Ed Mercer in a The Orville episode.
Even if senior Starfleet or Planetary Union officers are authorized to officiate at weddings, the same is not necessarily true of naval and civilian maritime officers today: RE: Are ships captains allowed to marry people at sea?