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Lt. Col. Dwayne Slack, 307th Maintenance Group commander, gives his farewell to Tech. Sgt. Christopher Marien, 307th Maintenance Squadron Aerospace Ground Equipment mechanic, after Marien’s retirement ceremony on Barksdale Air Force Base, La., Dec. 2, 2017. During his 34 years in the Air Force, Marien served in several major operations and also as a member of the base honor guard. (U.S. Air Force photo by Tech. Sgt. Cody Burt/Released)
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