1943-45: During World War II, a banner is hung from the Campanile with a number indicating the more than 17,000 members of the UC community in military service. (A similar flag, with the number 2,200, flew during World War I.) In 1943, the chimes fall silent for the first time due to wartime UC budget cuts. After students complain, alumni raise funds to resume the daily performances. On May 8, 1945, the chimes are played two continuous hours to celebrate the end of World War II in Europe.

During most of the war, economic constraints also force closure of the tower’s observation deck. It reopens to visitors in late summer 1944.