Dickerson

Lieutenant Dickerson was a security officer serving aboard the USS Enterprise (NCC-1701).

Dickerson was the officer who announced the arrival of Abraham Lincoln in 2269, following Lincoln's discovery by the USS Enterprise near the planet Excalbia. 

Background
Dickerson was played by actor Arell Blanton. Dickerson appeared to be among the highest echelons of security officers aboard the Enterprise at that time. It is also possible that he was the ship's chief of security in 2269, a position previously held by Lieutenant Commander Giotto.

Dickerson wore a Starfleet dress uniform reused from a previous episode, where the decorations and braid at the collar represented a lieutenant commander, however, Dickerson was addressed as "lieutenant".

Dickerson