The Longest-running Ad Campaign in U.S. History!

Smokeybear.com provided us with the interesting backstory:

The answer begins with World War II. On December 7, 1941, Japanese planes attacked Pearl Harbor. The following spring, Japanese submarines surfaced near the coast of Santa Barbara, California, and fired shells that exploded on an oil field, very close to the Los Padres National Forest. Americans were shocked that the war had come directly to the American mainland. Fear grew that more attacks would bring a disastrous loss of life and destruction of property. There was also a fear that incendiary shells exploding in the forests of the Pacific Coast would ignite numerous raging wildfires.

With experienced firefighters and other able-bodied men deployed in the war, communities had to deal with wildfires as best they could. Protection of forests became a matter of national importance, and a new idea was born. If people could be urged to be more careful, perhaps some of the fires could be prevented. To rally Americans to this cause, and convince them that it would help win the war, the Forest Service organized the Cooperative Forest Fire Prevention (CFFP) program with the help of the War Advertising Council and the Association of State Foresters. Together, they created posters and slogans, including "Forest Fires Aid the Enemy," and "Our Carelessness, Their Secret Weapon."

In a stroke of luck for the cause, in 1942, forests and their animal inhabitants were celebrated in Walt Disney's wildly popular motion picture, "Bambi." Disney allowed the CFFP program to use the film’s characters on a 1944 poster. The "Bambi" poster was a success and proved the success of using an animal as a fire prevention symbol. However, Disney had only loaned the characters to the campaign for one year. The CFFP would need to find an animal symbol that would belong to them, and nothing seemed more fitting than the majestic, powerful (and also cute) bear.