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Calvin Moore was a Human male. He was dark-skinned, possessed a slight build but was also tall and wiry. Moore was a Lieutenant in Starfleet and served aboard the USS Defiant as a security officer. He was considered to be a veteran of ground combat.
In January 2377, Moore was one of several Defiant security personnel who beamed down to Harkoum to capture Taran'atar and return him to Deep Space 9. Moore was able to aim and shoot targets without the need of targeting sensors. (DS9 novel: Warpath)