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Julian DiMarco is formerly the commanding officer of Columbia.
William Adama served under DiMarco for a few years as his executive officer until DiMarco where they became friends. Having achieved the rank of admiral, DiMarco retired from the Colonial Fleet and entered the Expeditionary Fleet a few years prior to Adama's assuming command of Galactica.
A ship he was on, having left Colonial space and into Neutral Space, was deemed lost and Adama was given the mission to search for it and DiMarco (Battlestar Galactica: Season Zero 1).