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Sergeant First Class Charles Lewis Grey (United States Army, callsign "Betty Blue") (portrayed by Michael Irby) is a Unit operator whose specialty is electronics, engineering, explosives and is also trained as a medic. He is proficient in many other languages, including Spanish, French, Arabic, and Korean. Before his service in the Army, he was a member of a Latino gang called the "Byz-Lats" based in Farmington, Los Angeles.