In the last twenty years, there has been tremendous evolution of small unmanned ground-based robots.
The first concept was RoBattle, a seven-ton wheeled modular drone transport vehicle, capable of carrying three tons of cargo, a great Israeli concept that never entered service.
One of the first robots to enter service was the PackBot 510, which began serving in 2002.
Various military applications have driven the development of these robots, including infantry, armor, artillery, and special operations.
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Author's summary: Evolution of combat robots in the last twenty years.