Which technological innovation revolutionized military retail operations during the Vietnam War era, allowing for better inventory tracking at PX facilities?

Post-Exchange (PX) stores have been vital to military morale and logistics for centuries. These military retail operations have evolved from simple sutler wagons following armies to sophisticated global retail networks supporting troops and families worldwide. This poll explores how military retail technology advanced during a critical period of military history, fundamentally changing how armed forces access essential goods.

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IBM's military-specific point-of-sale systems with punch card inventory tracking
Handheld barcode scanners with satellite connectivity to central command
ARPANET-connected electronic cash registers with real-time inventory updates
Microfilm-based catalog ordering systems with telephonic order processing