Hydrogen as tank fuel? Gaw, and I thought the army was stupid for using jet fuel in their tanks. Didn’t they learn their lesson in WW2? The Sherman tank ran on gasoline, and it was nicknammed the “Tommy cooker” by the Germans, and the “Ronson” by the allies because it never failed to light.

Dozens of Abrams tanks have already burned to the ground because they run on very flammable fuel. Switching to hydrogen is just going to exasperate the problem. The T-80 was the only other tank with a turbine engine, and the Russians scraped the idea after they all caught on fire in combat.