Which innovation fundamentally transformed military retail operations during World War II, becoming the foundation for today's modern Army & Air Force Exchange Service (AAFES) and Navy Exchange (NEX) systems?

The military retail system has undergone significant digital transformation over decades, evolving from simple trading posts to sophisticated global retail operations. Today's military exchanges combine physical stores with advanced e-commerce platforms, serving military communities worldwide. This trivia question explores a pivotal moment in the development of the modern military retail experience that impacts millions of service members and their families.

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Introduction of the PX (Post Exchange) mobile trailer units that could follow troops to the frontlines
Implementation of the first military credit card system called 'Service Pay'
Launch of the 'Victory Catalog' mail-order system for deployed troops
Creation of the first consolidated procurement system called 'Unified Supply Chain'