Communication was another issue. Even by the start of WW2, there were tanks in production which did not have radios. There's a delightful photo I've seen in a documentary of a tank crew member's hand, stuck out of a flappered hole in a British WW1 tank ... launching a carrier pigeon.

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John Levin

Scientist. Writer. Meditator. Blue Tantrika. Mystical Rabbi. Climate & Human Rights Activist. I’m a man of few words, except when I open my mouth.