Anyone who’s seen Boston Dynamics’ four-legged robots in action typically is wowed by their speed, strength, and agility, but also note how loud they are. They sound like chain sawd on steroids. And that decibel level is apparently a problem for potential customers, namely the U.S. military.

For Marines who took the robot out for a spin, that noise is apparently a deal breaker. “They took it as it was: a loud robot that’s going to give away their position,” a spokesman for the Marines’ Warfighting Lab told last week.

The Legged Squad Support Systems (LS3) robots were built by Google-owned Boston Dynamics with $32 million in funding by the Defense Advanced Research Projects Agency (DARPA) and the U.S. Marine Corps, with an assist from partners including Bell Helicopter, Carnegie Mellon, the Jet Propulsion Laboratory, and others, according to the Boston Business Journal.

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