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Alexander Basil Matthews (November 21, 1942 – September 22, 2018) was an American actor and singer, best known for his appearance as Gunnery Sergeant Apone in the James Cameron film Aliens (1986). He reprised his role 27 years later, providing the voice of Apone for the video game Aliens: Colonial Marines (2013). Matthews' portrayal of Apone was the inspiration for Sgt. Avery Johnson of the Halo franchise. Wikipedia