The President's description of December 7, 1941 as "a date which will live in infamy" was borne out; the date very quickly became shorthand for the Pearl Harbor attack in much the same way that November 22, 1963 and September 11, 2001 became inextricably associated with the assassination of John F. Kennedy and the September 11 attacks, respectively. The slogans "Remember December 7th" and "Avenge December 7" were adopted as a rallying cry and were widely displayed on posters and lapel pins. "Prelude to War" (1942), the first of Frank Capra's "Why We Fight" film series (1942–45), urged Americans to remember the date of the Japanese invasion of Manchuria, September 18, 1931, "as well as we remember December 7th, 1941, for on that date in 1931, the war we are now fighting began". The symbolism of the date was highlighted in a scene in the 1943 film "Bombardier", in which the leader of a group of airmen walks up to a calendar on the wall, points to the date ("December 7, 1941") and tells his men: "Gentlemen, there's a date we will always remember—and they'll never forget!"