Which innovative retail logistics system did the U.S. military pioneer during WWII that later revolutionized civilian retail supply chains?

Post Exchange (PX) stores have been a cornerstone of military life for over a century, providing troops with essential goods and a touch of home while deployed. These retail operations have evolved dramatically through major conflicts, becoming sophisticated retail networks with billions in annual sales. Test your knowledge about this unique military retail system that has influenced both military morale and civilian retail practices throughout history.

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Standardized shipping containers and palletized loading
Refrigerated transport vehicles for perishable goods
Computerized inventory tracking systems
Aerial delivery via parachute drops for retail goods