Last week some 200 officers, manufacturers, newsmen saw the Army's newest tank in action. It was an M3: a 25-ton armored hulk, abristle with four machine guns and two cannon, seven tons heavier than the few medium tanks already in service. The Army last week had only this one model, but within two or three months medium tanks should begin to roll from three new tank factories (Chrysler, American Locomotive, Baldwin Locomotive).

Host and demonstrator at the Aberdeen (Md.) Proving Ground was hard, white-haired, tank-wise Colonel John K. Christmas.* The day was cold and raw; the red Maryland clay was muddy...

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