Liaison officer
From Memory Alpha, the free Star Trek reference
A liaison officer was usually a spokesperson who represented the interests of his or her government.
Kira Nerys was the Bajoran liaison officer onboard the space station Deep Space 9 since 2369, representing the Bajoran Provisional Government and the Bajoran Militia when the Federation helped rebuild it. (Star Trek: Deep Space Nine)
One job of the liaison officer aboard DS9 was to compile the material subsistence report, a job that Commander Sisko had to do when Kira was unable to assist him. (DS9: "Progress")
Julian Bashir acted as a liaison when the Federation ambassadors Taxco, Lojal, Vadosia, and Lwaxana Troi visited Deep Space 9 later in that year. (DS9: "The Forsaken")
Li Nalas was Deep Space 9's liaison officer for a brief period in early 2370. It was shortly after his return from prison on Cardassia IV. (DS9: "The Homecoming", "The Circle", "The Siege")
A Cardassian liaison officer kept in close contact with Starfleet Admiral Kennelly during the crisis involving the Bajoran resistance leader Orta and his alleged attack on Solarion IV. (TNG: "Ensign Ro")
