Which retail technology advancement was first widely implemented in U.S. military PX stores in the 1970s, significantly improving inventory management during the post-Vietnam era?

Military retail has a fascinating evolution through history. Post Exchanges (PX) and Base Exchanges (BX) have been crucial for troop morale and logistics for centuries. These military retail operations have adopted unique branding, technologies, and retail management strategies that often differed significantly from civilian counterparts. This trivia tests your knowledge about an important technological advancement that revolutionized military retail operations during a critical period in military history.

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Barcode scanning systems
Credit card payment terminals
Computerized cash registers
Electronic shelf labels