#3rd arm

ABERDEEN PROVING GROUND, Md. — When engineers from the U.S. Army Research Laboratory brainstormed on how to improve Soldier lethality, the idea of a third arm seemed like something that might help. Mechanical engineer Dan Baechle carefully planned out a device that doesn’t need batteries, is lightweight and can evenly distribute the load of a heavy weapon. “It can help stabilize the weapon and…