During World War II, which innovative retail marketing strategy did the U.S. Army Exchange Service introduce to boost morale among troops stationed overseas?

The Post Exchange (PX) system represents one of the most successful retail operations developed specifically for military personnel. These stores have evolved dramatically since their inception, becoming a crucial part of military life and morale. This trivia question explores how military retail marketing adapted during a pivotal historical period to meet the unique needs of service members deployed worldwide.

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Mobile PX trucks that brought familiar American products directly to forward combat zones
Loyalty point system where soldiers could earn medals in exchange for retail purchases
Celebrity-endorsed product lines exclusively available to military personnel
Virtual shopping catalogs allowing troops to order items for delivery after returning home