How did World Wars I and II increase the use of organized security systems?

World Wars I and II significantly increased the awareness of security systems as essential tools for protection against military espionage, sabotage, and subversion. During these conflicts, such programs were integrated into national national-security systems.1

Following World War II, much of this security apparatus was retained due to ongoing international tensions and the requirements of defense-production programs. This transition helped transform security measures into an increasingly professionalized complex of functions. While the importance of traditional locks as a primary defense against professional thieves declined after the war—partly because the widespread dissemination of knowledge regarding explosives led criminals to bypass locks by blowing them off—the broader infrastructure of organized security continued to evolve and expand in the postwar era.12