How did World War II influence the growth of systems engineering?

World War II was a pivotal catalyst for the development of systems engineering, primarily through the emergence of operations research. Originating in Britain during the war, operations research focused on the optimal employment of military equipment—such as determining the best use of bombers, organizing convoys against submarine attacks, and deploying interceptors against air raids.1

While operations research dealt with existing equipment, it shared essential analytical techniques with systems engineering, which focuses on the planning and design of new, complex systems. The war also necessitated massive, multidisciplinary efforts like the Manhattan Project, which served as a foundational model for later large-scale government projects involving diverse scientific and engineering fields.12

Following the war, the field matured as military requirements grew more complex. By 1945, the development of the Nike Ajax missile system required an integrated systems engineering approach to balance tactical characteristics like range, maneuverability, and trajectory. These postwar military challenges established the framework for managing complex feedback loops and large-scale technical projects that define the discipline today.3