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I would say Dr. Lenoard McCoy. He served in Starfleet from the 2240's to the 2350's. Captain Montgomery Scott started his career in Starfleet in the 2240's and was still in Starfleet in 2369. However, he spent about 75 years trapped in a transporter beam. Spock did not begin his career until the 2250's and he left Starfleet a couple of times, eventually ending up as a civilian ambassador. These are all canon and prime universe references as I know nothing about the alternate versions. Admiral William Thomas Riker 17:50, August 3, 2011 (UTC)

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