At guns


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https://i.military-review.com/images/008/image-22813-1-j.webp

https://military-review.com/12526477-37-mm-automatic-recoilless-gun-kondakov-the-ussr-30th

https://i.military-review.com/images/008/image-22813-3-j.webp

ZiS-3 for engineer I and anti-tank I
ZiS-2 for engineer II and anti-tank II