Which retail innovation was first widely implemented in Army Post Exchanges during the Vietnam War, revolutionizing how soldiers could purchase goods?

The Post Exchange (PX) system has been a crucial part of military life since the 19th century. These retail operations have evolved from simple sutlers' tents to sophisticated retail establishments that boost morale and provide essential goods to service members and their families. This poll explores a key corporate history milestone in military retail that transformed how armed forces personnel shop while deployed.

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Military credit card system (MilPay)
Military Payment Certificates (MPC)
Catalog ordering system with battlefield delivery
Digital inventory management with RFID tracking