General Dynamics, the defense contracting juggernaut, showed off a prototype of its next-generation military tank, the AbramsX. It’s the biggest upgrade of America’s military tank technology since early in the Cold War, former military officials said, which presents both critical design advances and worries about unnecessary military spending.

The AbramsX comes loaded with features typical of modern military weapons. Powered by a hybrid electric diesel engine, it’s lighter and far more fuel-efficient than current gas-guzzling Abrams tanks. It can also operate with a smaller crew and has artificial intelligence systems to spot enemies, its creators said.

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