Why did security programs continue to expand after World War II?

Following World War II, security and protection programs expanded significantly as much of the apparatus developed during the war to combat military espionage, sabotage, and subversion was retained. This retention was driven by persistent international tensions and the requirements of defense-production programs, which led to the integration of these measures into an increasingly professionalized complex of security functions.1

While the term "social security" often refers to government welfare programs, in the context of personal and property protection, the post-war era solidified the role of security systems as a vital component of national-security infrastructure.1