Which innovative retail strategy was first widely implemented in military PX stores during World War II that revolutionized civilian retail after the war?

The Post Exchange (PX) system has been a crucial retail element supporting military personnel and their families for generations. These military retail operations have evolved dramatically through major conflicts, adapting sales techniques and retail strategies to meet the unique needs of service members. Test your knowledge about how military retail operations have transformed through history and continue to innovate today.

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Self-service shopping (customers selecting their own items rather than requesting them from clerks)
Mail-order catalogs with delivery to front lines
Membership-based shopping requiring military ID
Commissary credit card system