Which retail inventory management innovation was first widely implemented by the U.S. Army during the Vietnam War to track and distribute supplies to remote forward bases?

During major conflicts, military retail systems have evolved dramatically to support troops in the field. The Post Exchange (PX) system has undergone remarkable innovations in inventory management and logistics to maintain soldier morale and combat readiness. This poll tests your knowledge about a significant retail innovation that transformed how the U.S. military supplied its personnel during a major conflict.

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Automated RFID tagging system for equipment tracking
IBM punch card inventory system (MILSTRIP)
Barcode scanning technology for PX supply chains
Satellite-based digital requisition network