Which retail innovation was specifically developed for U.S. troops during WWII that revolutionized military supply chains and later became a cornerstone of modern retail logistics?

During World War II, retail strategies underwent dramatic transformations as governments and businesses adapted to wartime conditions. Military merchandising became a crucial aspect of both morale-building and practical supply. This poll tests your knowledge of how retail marketing intersected with military history during one of history's most significant conflicts. Do you know how civilian retail adapted to support the war effort?

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

The PX (Post Exchange) system with standardized pricing across all theaters of war
K-rations with branded, shelf-stable products from major food manufacturers
Mail-order catalogs specially designed for overseas military personnel
Military scrip currency used for controlled retail purchases in occupied territories