Why did military equipment become more complex during World War II?

During World War II, the complexity of military equipment increased significantly due to the rapid evolution of firepower and the integration of advanced technologies into combat operations. This transformation was driven by several key factors:1

• Increased Firepower and Mechanization: The shift toward mechanized warfare, characterized by the use of tanks, aircraft, and automatic weapons, required more sophisticated hardware. For example, a World War II infantry division had significantly more artillery pieces than its predecessors, and these weapons were capable of firing heavier projectiles with much greater speed.21
• Technological Innovation: The war spurred unprecedented research and development in fields such as electronics, radar, and communications. The need for split-second coordination among air, infantry, and armored units necessitated complex radio systems, while the threat of aerial bombardment led to the development of sophisticated navigational and detection devices.34
• Specialization and Scale: The sheer volume of items required—nearly 900,000 distinct types for the U.S. Army—meant that equipment became increasingly intricate, with some antiaircraft guns containing as many as 25,000 separate parts. This forced a massive industrial mobilization, requiring manufacturers to adapt to the production of highly technical components like recoil mechanisms and complex ammunition.1