Kagan

Kagan was supposedly a Starfleet officer assigned to Internal Affairs. In actuality, he was merely a hologram within a Section 31 simulation.

As part of the program, he accompanied Luther Sloan to Deep Space 9, during the investigation of Doctor Julian Bashir. Bashir was accused of being a Dominion spy. When Bashir was arrested, Kagan escorted him to a holding cell and was outraged at Bashir. He claimed that he was a member of the Seventh Fleet and had lost many good friends in the battle with the Jem'Hadar in the Tyra system. 

Kagan