Dirty Harry "Rawhide", was responsible for creating Callahan's distinctive old-fashioned brown and yellow checked jacket to emphasize his strong values in pursuing crime. Filming for "Dirty Harry" began in April 1971 and involved some risky stunts, with much footage shot at night and filming the city of San Francisco aerially, a technique for which the film series is renowned. Eastwood performed the stunt in which he jumps onto the roof of the hijacked school bus from a bridge, without a stunt double. His face is clearly visible throughout the shot. Eastwood also directed the suicide-jumper scene. The line, "My, that's a big
William M. Callaghan the Maritime Transportation Research Board under the National Academy of Sciences. He would later have a transport ship named after him: the . Late in life, Callaghan resided in Chevy Chase, Maryland. Following a stroke, he died on July 8, 1991, at Bethesda Naval Hospital. His first wife, Helen Brunett Callaghan (1896–1970), and second wife, Martha Rawlins Callaghan (1905–1973), predeceased him. He was survived by his third wife, Sarah Duerson Callaghan (1914–2011), and two children, William M. Callaghan Jr. (a retired US Navy rear admiral) and Jane Callaghan Gude (c. 1925–2008), as well as eight grandchildren. Callaghan's grandchildren include William