Rogue Bolo

From "An Abbreviated History of the Bolo": The direct ancestor of the Bolo was constructed in the 1990's. This machine, at one hundred fifty tons, was essentially a bigger and better tank; although it was capable of performing crewless patrol duty, it carried a crew of three in battle. The Mark II of 1999 was less dependent on human guidance. With its enhanced on-board fire control and guidance computers it required only one crewman for full battlefield operation.

In a sense, the Mark III of 2020 was a step backward: it required two operators. But the Mark III packed more effective firepower than an infantry battalion of the time, and its durachrome hull could withstand an atomic blast. The first Bolo designed to operate without direct human guidance was the Mark XV. The first self-aware Bolo was the Mark XX.