Which innovative retail practice did the Army & Air Force Exchange Service (AAFES) pioneer during the Vietnam War that revolutionized military retail operations?

The Post Exchange (PX) system has been a crucial part of military life for generations, providing essential goods to service members worldwide. This retail network has evolved significantly since its inception, becoming one of the largest specialized retail operations in the world. Test your knowledge about this unique military retail institution that has supported troops from battlefield camps to modern bases.

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Introducing the first mobile PX units that could follow troops to forward operating bases
Creating the first military credit card system called 'Star Card' for servicemembers
Establishing the first online ordering system for troops to request items from home
Implementing automated inventory management using early computer systems