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The U.S. Army has released footage of its "third arm" prototype created by engineers from the U.S. Army Research Laboratory at Aberdeen Proving Ground, Maryland. (Image: YouTube, U.S. Army Research Laboratory)

The U.S. Army has released footage of its "third arm" prototype created by engineers from the U.S. Army Research Laboratory at Aberdeen Proving Ground, Maryland. (Image: YouTube, U.S. Army Research Laboratory)

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