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It looks like a tank, drives on tracks like a tank, fires 120 mm shells at several times the speed of sound like a tank — but don’t call it a tank. The General Dynamics “Griffin” is a kind of concept car on steroids, a demonstration of existing technologies that could be quickly fit together for the Army’s Mobile Protected Firepower program. In a 28-ton package — less than half the weight of the M1 Abrams tank (which GD builds), Griffin combines the electronics of the latest model M1, the hull of the Britis
