The agency's implementation of censorship was done primarily through a voluntary regulatory code that was willingly adopted by the press. The phrase "loose lips sink ships" was popularized during World War II, which is a testament to the urgency Americans felt to protect information relating to the war effort. Radio broadcasts, newspapers, and newsreels were the primary ways Americans received their information about World War II and therefore were the medium most affected by the Office of Censorship code. The closure of the Office of Censorship in November 1945 corresponded with the ending of World War II.