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William J. Ross was a Human male who served as a Starfleet officer in the mid- to late-24th century. As an admiral, Ross took command of military operations during the Dominion War and led the Allied forces during the Battle of Cardassia, later presiding over the signing of the Treaty of Bajor, which ended the war.
Ross was a leader of Starfleet forces during the Dominion War and coordinated his battle plans from Starbase 375. When Captain Benjamin Sisko and his crew arrived at the starbase, Ross appointed him the lead in a mission to destroy a Dominion ketracel-white facility using the Jem'Hadar attack ship they had captured a year prior. Later that year, he was present for and supported Operation Return, Captain Benjamin Sisko's plan to retake the key space station Deep Space 9.
Behind closed doors, Ross would secretly aided the covert Federation organization Section 31 by helping their agents infiltrate the first Federation-Romulan conference on Romulus. Ross would defended his actions by stating that he had no choice, and that while he disliked doing what he did, he also disliked ordering young women and men to die. Ross stated he felt helping the rouge organization was the best way to maintain the Federation alliance against the Dominion.