The Sukhoi PAK FA (Russian: Perspektivny Aviatsionny Kompleks Frontovoy Aviatsii, literally "Prospective Airborne Complex of Frontline Aviation") is a twin-engine jet fighter being developed by Sukhoi for the Russian Air Force. The Sukhoi T-50 is the prototype for PAK FA. The PAK FA is one of only a handful of stealth jet programs worldwide.

The first generation T-34 medium tank made its debut in combat during the summer of 1941, when the Wehrmacht launched its invasion of the Soviet Union. The T-34 easily outclassed the German PzKpfw III and IV models, thanks to its hard-hitting 76.2mm main gun, thick frontal armor, wide tracks, and overall superior mobility.

The Shenyang J-50 is a temporary designation given by military analysts and defense media to a twin jet tailless lambda wing aircraft under development by the Shenyang Aircraft Corporation (SAC). The aircraft was observed in flight testing in Shenyang, Liaoning, China in December 2024, which was tentatively named Shenyang J-XD or Shenyang J-50 by analysts, given the limited available information.

The Shenyang J-31 (or "FC-31 fifth Generation Multi-Purpose Medium Fighter") also known as the "Gyrfalcon"  or "Falcon Hawk" by some military enthusiasts, is a twin-engine, mid-size fifth-generation jet fighter currently under development by Shenyang Aircraft Corporation.

The Flakpanzer 38(t) was designed around the chassis of the Czech-built LT-38 tank and was built from November 1943 to February 1944, entering service in 1944. As the vehicle used the 38(t) Ausf M chassis, the engine was near the middle of the vehicle and the armament was placed at the rear in a specially designed armored section.

During the late 1960's a number of European countries examined ways to replace their existing fleet of combat aircraft using next-generation design techniques. Several countries looked at variable geometry wing configurations as a means of making a plane perform well throughout a wider flight envelope.