Which wartime product development project employed the most civilian scientists and engineers in history, costing nearly $2 billion (equivalent to about $29 billion today)?

Throughout history, military product development has transformed warfare and often led to civilian applications we use today. From ancient weapons to modern technologies, the research and development process behind military equipment represents some of the most innovative product development cycles in human history. Test your knowledge about a revolutionary military product development that changed the course of warfare forever.

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The Manhattan Project (atomic bomb development)
The V-2 Rocket program (Nazi Germany)
The M1 Abrams tank development program
The DARPA Internet precursor (ARPANET)