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John Groff was a brigadier general in the United States Marine Corps whose military career spanned from 1912 to 1946. Groff was a highly decorated veteran of World War I, earning the Navy Cross, Distinguished Service Cross, Silver Star, and Purple Heart medals. He also participated in the Banana Wars, and World War II. At the time of his death in 1990 at age 100, BG Groff was the oldest surviving general officer in the Marine Corps.