US Marines Refuse to Undertake Missions with "Robotic Mules".

WASHINGTON - United States marines have refused to go on military missions with the famous "robotic mules," designed by a Google-owned company and Pentagon with the objective of carrying heavy material for the army

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The marines do not want to go to battlefields with the robotic mules - a four legged robot capable of carrying almost 200 kg (441 pounds) - as they make "too much noise," making them incompatible with military discretion, according to the magazine Military.com Tuesday.

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

In 2012, the Pentagon announced having designed the robotic mule with a carrying capacity of up to 180 kg (397 pounds) and with an ability to recharge batteries of radios and electronic military devices.

The robotic mule LS3 had been tested in different types of terrain that can be encountered during combat and also in different weather conditions including snow and rain.