Deputy Director

From Memory Alpha, the free Star Trek reference.

Deputy Director was a senior position in Starfleet's Department of Internal Affairs.

Luther Sloan (of Section 31) claimed to hold this position while he posed as an agent of Internal Affairs while aboard Deep Space 9 in 2374. Sloan wore a Starfleet uniform with a modified captain's rank insignia during his subterfuge. (DS9: "Inquisition")

[edit] Background

The sole appearance of "Deputy Director" was in "Inquisition" when the title was apparently held by Luther Sloan. His insignia, which consisted of the four pips of a captain centered over a single gold bar, has never appeared in any other production.