During land warfare, every weapon was made to fill a specific need. Designed for a single purpose: to win the race for technological supremacy over the enemy.

Naval warfare evolved from battleships to submarines, then aircraft carriers. Pivotal battles in the Atlantic and Pacific hinged on megaship production.

The Germans go from Junkers 88 to V rockets to ME 262 relying on slave labor. The Americans has the Liberator and Rosie the Riveter. The British has the Spitfire and dispersed production. The Japanese has the Zero but production struggled.