M-40 at Ft. Knox

When the need for a 155mm self-propelled gun was finally recognized in early 1944, a newer model gun was placed on a Sherman chassis with a suspension called HVSS (horizontal volute spring suspension) to compensate for the greater weight.  Only 311 were finished by the end of the war, and its first use was at Cologne in the spring of 1945.  Had the US Army Ground Forces been more accepting of innovation, the troops could have been supported by an excellent weapon such as this for much of the war.

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