Which WWII-era military retail innovation is considered the direct predecessor to modern mobile commerce applications used by today's armed forces?

During World War II, militaries around the world faced unprecedented logistical challenges in supplying their troops. This led to remarkable innovations in military retail operations and product distribution systems that would later influence civilian retail strategies. Some of these wartime innovations continue to impact modern retail systems, particularly in mobile commerce and supply chain management. Test your knowledge about this fascinating intersection of military history and retail innovation!

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The U.S. Army's Mobile PX (Post Exchange) System that used modified 6x6 trucks to deliver retail goods to frontline troops
The German Wehrmacht's 'Feldkantinen' cataloging system that tracked soldier purchases using punch cards
The British Royal Navy's shipboard 'NAAFI' wireless ordering system for resupplying vessels at sea
The Soviet Red Army's centralized 'Military Trade' distribution network that used radio coordination for supply drops