Dave Bailey

David "Dave" Bailey was a officer on active duty in the 23rd century.

Lieutenant Bailey transferred to the Enterprise after the death of alpha-shift helmsman Lieutenant Commander Gary Mitchell on Delta-Vega in 2265, and Lieutenant Hikaru Sulu's repositioning from astrophysicist to helmsman. ( trilogy: Constitution)

After Enterprise's first contact with a member of the First Federation, Bailey became the Federation liaison to this newly-encountered species. 

In 2270, Bailey was promoted to commander and given command of the USS Nelson, a destroyer on patrol near Orion territory. (Orion Press: "False Colors")

By the mid-2280s, Bailey was an officer in Starfleet's Planetary Relations division. (Orion Press: "The Return")

Circa 2286, Bailey was one of the former Enterprise officers who rejoined Kirk and the crew of the Enterprise-A when they battled aliens who had attacked Starfleet, Klingon and Romulan vessels since at least the 2250s.