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One of the biggest initiatives of World War II was Operation: Firefly – a project so top-secret, not even Captain America was briefed. But how did it involve the super-powered soldiers of the U.S. Army? And why is it still a mystery in the present day, when Cap, its own survivors, and even Loki, the Norse god of mischief, are all looking for answers? By Paul Jenkins (X-MEN: PRELUDE TO SCHISM) and Carmine Di Giandomenico (INVINCIBLE IRON MAN).

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