Shots of Canadian Civil Defence man with helmet directing traffic. Interior shot of Canadian Civil Defence headquarters, many civilians working, some military. Shot of inscription on door "Operation Centre Target Area Headquarters". Shots of man writing on transparent board, military officers, civilians telephoning, sitting at desk. PL EN CP d'un poteau avec une sirène d'alerte au-dessus, PRs de la sirène d'alerte. (00/08/1961)