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Why did the Sentinels of Liberty stop offering metal membership badges during World War II?

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Chris Evans as Captain America stands in costume holding his shield, with an American flag and sunlight in the background. — Captain America Chris Evans as the title character in *Captain America: The First Avenger* (2011), directed by Joe Johnston.

The Sentinels of Liberty, the fan club for Captain America, originally offered new members a membership card and a metal badge for a dime. However, this promotion was discontinued during World War II due to wartime metal rationing.1