Which major retail expansion strategy did the Army & Air Force Exchange Service (AAFES) implement during the Vietnam War that revolutionized military shopping?

Post Exchanges (PX) and Base Exchanges (BX) have been crucial to military life for generations, providing essential retail services to service members and their families worldwide. These distinctive retail operations have evolved significantly over time, adapting to changing consumer trends, technological advances, and the unique needs of military communities. This trivia question explores a notable retail expansion decision that changed the landscape of military shopping during a critical period in military history.

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Introduction of mobile PX units that followed combat units into forward areas
Merger with Navy Exchange (NEX) to create a unified military retail system
First implementation of online catalog ordering for deployed troops
Exclusive partnership with Coca-Cola to supply all military bases worldwide