The future of the nightmare-fuel robot war machines designed by Google-owned Boston Dynamics looks bleak after the US Marines announced they would no longer work with the robo-dogs. The reason? The things are just too loud, too, dare we say, disruptive.

Like some demon lawnmower struggling through tall grass, the gasoline-powered machines made too much noise as they trudged through the weeds to deliver supplies to troops during recent military exercises, notes CNET.

In conversation with Military.com, a spokesperson for the Marine Corps' Warfighting Laboratory elaborated on the decision to drop the $32-million project.

"As Marines were using it, there was the challenge of seeing the potential possibility because of the limitations of the robot itself," noted Kyle Olson. "They took it as it was: a loud robot that's going to give away their position."

The machines, officially known as LS3 Robots, were designed by Boston Dynamics in collaboration with the Defense Advanced Research Projects Agency, or DARPA. The company also made a smaller version of the LS3, known as "Spot," that was recently featured in a creepy Christmas-themed promotional video.

The founder of Boston Dynamics, Marc Raibert, told CNET that regardless of the military's recent decision, the company does not consider the project a failure.

"LS3 is a research program to show the feasibility of legged robots, not a candidate system to be deployed," said Raibert. "So framing the program as 'shelved' is not how we think about it."

Captain James Pineiro of the Warfighting Laboratory told Military.com that both the LS3 and Spot models are in storage, with no future military experiments planned. The robo-dogs of war are back on their leash, it seems.

In addition to showing the LS3 in action, the below video does a good job of demonstrating how much noise the machines actually make.

Related: Google-Owned Robot Maker Ruins Christmas With War-Machine Dogs Pulling Santa's Sleigh