Despite the $ 32 million already invested in the development of the BigDog cargo robot, the US Marine Corps decided to refuse further funding for this project. The robots developed by Boston Dynamics have not passed a number of field trials. Rather, the gasoline LS3 and electric Spot options did the trick, but not the way the military planned. The cars turned out to be too noisy, which in practice could lead to the failure of the military operation, betraying the location of the detachment with loud noises. It was the gasoline version of the LS3 that turned out to be the noisiest. In addition, the military stated that repairing the robot in the field is extremely difficult. The electric version of Spot turned out to be quicker and quieter, but the load capacity turned out to be too low – only 18 kg, instead of 180 kg required by the military – but the LS3 easily coped with this weight. Also, the military could not develop a scenario in which BigDog would become a reliable assistant in patrol or in other tasks. And this despite the fact that they supported the project since 2010, and field trials were carried out almost every year.