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Text from item: "Alert America" Convoy parades in Boston, follows Boston's first postwar air raid alert. Spearheading the national Civil Defense "Alert America" Campaign to revolutionize public thinking about the citizen's responsibilities and dangers in modern war. The Alert America convoy paraded through the city on February 21. At the head of the parade was a battery of troops from the 748th AA Gen Battalion, Fort Banks. Here the parade is shown passing the reviewing stand in front of the Public Library, Copley Square.