Pair of Federation Department of Temporal Investigations agents who questioned Benjamin Sisko about the Defiant's unplanned trip into the past.
Dulmer and Lucsly are agents of the Federation's Department of Temporal Investigations, the office responsible for policing time travel. Dry, methodical and deeply suspicious of anything that might disturb the timeline, they treat temporal incidents as bureaucratic matters to be documented in full.
In Trials and Tribble-ations, they question Benjamin Sisko about the Defiant's unexpected journey back to the era of the original Enterprise, where the crew had to stop a Klingon plot to kill James T. Kirk. They listen to his account with weary disapproval, though Sisko admits that he could not resist meeting Kirk.