Federation Diplomatic Corps
From Memory Alpha, the free Star Trek reference
The Federation Diplomatic Corps is a body of the Federation that negotiates with other powers. Members of the Diplomatic Corps were present at the Khitomer Conference. (Star Trek VI: The Undiscovered Country)
In 2373, a member of the Diplomatic Corps and an old friend of Curzon Daxs', informed Jadzia that representatives from worlds along the Federation-Klingon border were urging for a preemptive strike. (DS9: "Broken Link")
In 2375, during the Dominion War, the Corps main diplomatic focus was with the Dominion. This meant they were unable to mediate in a border dispute in the Goren system. (Star Trek: Insurrection)
- According to the script for Star Trek V: The Final Frontier, St. John Talbot was a veteran of the diplomatic corps.
