Hd-8 (United States)

An American heavy tank prototype developed during World War II. It featured a 105mm gun and even thicker armor than the Hd-7, but it was also deemed too complex for production.

Hc-404

A Soviet 122mm howitzer, widely used by the Red Army during World War II. It was known for its versatility and ability to provide accurate fire support for infantry and armored units.

Hc-405

A German 88mm anti-aircraft gun, also used effectively as an anti-tank gun. It was one of the most versatile and powerful artillery pieces used during World War II.

Hc-406

A Japanese 75mm mountain gun, designed for use in rough terrain. It was used extensively by Japanese forces in the Pacific theater during World War II.

Hc-407

A British 25-pounder field gun, one of the most widely used artillery pieces by the British Army during World War II. It was known for its long range and accuracy.

Hd-1 (Germany)

A German heavy tank prototype developed in the early 1930s, featuring a powerful 105mm gun and heavy armor. It was ultimately rejected in favor of the Panzer III and Panzer IV designs.

Hd-2 (Germany)

A German heavy tank design proposed in 1942, intended to be a successor to the Tiger I. It featured a 128mm gun and thicker armor, but was never built due to resource constraints.

Hd-3 (Germany)

A German heavy tank design project initiated in 1943. It aimed to develop a super-heavy tank with a 150mm gun and exceptionally thick armor, but the project was abandoned due to logistical challenges.

Hd-4 (Germany)

A German heavy tank design from 1944, intended to be a successor to the Tiger II. It featured a 128mm gun and even thicker armor than its predecessor, but it was never built due to the war’s end.

Hd-5 (Japan)

A Japanese heavy tank prototype developed in the 1940s. It featured a 75mm gun and thick armor, but was never deployed due to production limitations.