The following personnel served aboard the Constitution-class USS Lexington in 2268.
It was that year that her entire crew came under attack by the M-5 multitronic unit during a Starfleet war games problem, of which 53 were killed during the initial attack by the USS Enterprise. (TOS: "The Ultimate Computer")
Named[]
Unnamed []
Bridge crew []

Three bridge crewmembers
These three crewmembers were on the bridge of the USS Lexington when the ship was involved in a mock battle scenario against the USS Enterprise. A command division lieutenant and a sciences division crew woman assist an operations division lieutenant to the turbolift. (TOS: "The Ultimate Computer")
Command lieutenant []

A command division lieutenant
This command division lieutenant served on the bridge of the USS Lexington when the ship was involved in a mock battle scenario against the USS Enterprise. She was monitoring bridge activities, including doings at the science station, while carrying an electronic clipboard. (TOS: "The Ultimate Computer")
Science officer []

A crewman
This lieutenant science officer served on the bridge of the USS Lexington when the ship was involved in a mock battle scenario against the USS Enterprise. (TOS: "The Ultimate Computer")