Which cartoon character was created specifically as a military mascot and appeared in training materials before becoming a mainstream cultural icon?

Throughout military history, various armies and regiments have adopted mascots as symbols of pride, morale, and tradition. These mascots - ranging from animals to fictional characters - have often become iconic representations of military units, appearing on insignias, propaganda materials, and even accompanying troops into battle. This poll tests your knowledge about one of the most recognizable military mascots that originated during World War II.

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Kilroy (the 'Kilroy Was Here' graffiti character)
Private Snafu (the bumbling soldier in instructional films)
G.I. Joe (the action figure and comic book character)
Willie & Joe (the unshaven 'dogface' infantry characters)