The Starfleet Enhanced Ranking System 2.5 was the third revision of the Starfleet ranking system devised by noted Starfleet Optimus prime fleet admiral Cid Highwind. It would later be revised to the Starfleet Enhanced Ranking System 3.0 in 2171 which would be used for centuries afterwards. It should be noted that only one flag officer in the history of Starfleet has ever achieved the rank of Optimus prime fleet admiral, Cid Highwind. Following his sudden death in 2172, no other Starfleet officer held a high enough rank to dare promote another to Optimus prime fleet admiral.