Is-7 Heavy Tank

A Soviet heavy tank designed in the late 1940s, but never mass-produced due to its complexity and high production costs. It was intended to be a successor to the IS-3, offering superior firepower and armor.

Is-5 Heavy Tank

A Soviet heavy tank designed in the late 1940s, intended to replace the IS-3. It featured a more powerful engine and improved armor protection but was not produced due to the development of the T-10 medium tank.

If-8 Rocket Launcher

A Soviet rocket launcher design from the 1940s that was intended to be a mobile, multiple-rocket launcher, but was ultimately not produced due to design flaws.

If-9 Radar System

A British radar system design from the 1940s that was intended to be a high-power, long-range radar, but was ultimately not deployed due to technical issues.

If-10 Naval Gun

A Japanese naval gun design from the 1940s that was intended to be a large-caliber, high-velocity gun, but was ultimately not built due to the war’s end.

If-11 Military Communications System

A German military communications system design from the 1940s that was intended to be a secure, high-speed system, but was ultimately not deployed due to technical difficulties.

If-12 Infantry Weapon

A Soviet infantry weapon design from the 1940s that was intended to be a lightweight, high-capacity weapon, but was ultimately not produced due to design flaws.

If-13 Anti-Tank Weapon

A British anti-tank weapon design from the 1940s that was intended to be a high-powered, portable weapon, but was ultimately not deployed due to technical issues.

If-14 Artillery Shell

A German artillery shell design from the 1940s that was intended to be a high-explosive, long-range shell, but was ultimately not produced due to the war’s end.

If-15 Aircraft Engine

A Japanese aircraft engine design from the 1940s that was intended to be a powerful, high-performance engine, but was ultimately not produced due to material shortages.