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What happened to the American flags on the moon?

As a symbol of the Fourth of July holiday, it is easy for the conversation this time of year to turn to iconic American flags, like the flag the Marines raised at Iwo Jima; the one firefighters put up at ground zero; and the one that flew over Fort McHenry and was the inspiration for what would become our national anthem.

As the space shuttle program comes to an end this week, CBS News decided to look into the flags the astronauts left behind on six trips to the moon. What's become of them?