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From a certain angle, Calvary's life could have been from a fairy tale. She was left on a doorstep on a cold and rainy night.

Except that doorstep was on the alien planet of Kamino.

And that doorstep was Jango Fett's, the clone template.

She was taken to live with the rest of the clones, who accepted her as one of their own. She aged normally, while the others aged twice as fast. But she still went to war with the rest of the clones. She was assigned to the 501st, to fight along General Skywalker.

The Cavalry has arrived.