Dexter O. Armbruster was a 23rd century Human man, born around reference stardate 1/64, in the 2220s. Armbruster was a career Starfleet officer, and by the 2280s he had risen to flag officer rank in the Starfleet Intelligence agency. By stardate 2/23, he was the chief of Starfleet Intelligence and held a security clearance (SECLAR) of 8, one of the highest levels in the Federation.