Humphrey Bogart and Lauren Bacall attend a war rally at Soldier Field for “I Am an American” Day

Soldier Field frequently hosted war shows throughout the 1940s to promote bond sales, but 1945 was the only year a bond show coincided with “I Am an American Day,” or what is today known as Constitution Day. The 1945 rally also featured a reenactment of the raising of the US flag on Iwo Jima. A reenactment of this reenactment can be seen in Clint Eastwood’s 2006 film "Flags of Our Fathers."