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- Troops prepare to fire M12 GMC
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- M12 during demonstration at Aberdeen Proving Grounds 1943
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- 155 mm Gun Motor Carriage M12
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- 991st Field Artillery Batt troops manning M12s at Bildchen 1944
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- M12 attached 103rd Infantry Division near pillbox defenses in the Siegfried Line
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- M12 firing in Belgium 1944
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- M12 of the 11th Armored Division in action, Budesheim Germany 1945
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- M12 from 737th Tank Battalion, 5th Infantry Division Berdorf, Luxembourg 9 February 1945
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- 155 mm Gun Motor Carriage M12 in action Aachen 1944
M12 was a U.S. self-propelled gun developed during the Second World War. Only 100 were built. It mounted a 155mm gun M1917, M1917A1 or M1918 M1, depending upon availability, a weapon derived from the nearly identical French 155mm GPF gun of WW1 vintage. The M12 was built on the chassis of the M3 Lee tank.