The 3" GMC M10 Tank Destroyer was based on the medium tank M4A2 (diesel) and was armed with the 3" anti-tank gun. The turret only had a partial roof over its front third and on occasion in the field crews would add their own. The open top was to allow better visibility and easier servicing of the weapon, but at an obvious cost to protection.
Flames Of War contents: this blister pack contains 1x United States M10 GMC