Which retail innovation was first introduced at the Pentagon's shopping complex in 1976, revolutionizing how military personnel shopped for personal items?

The intersection of military history and retail innovation has produced some fascinating developments over the decades. Military bases worldwide have created unique retail environments to serve personnel and their families. One particularly notable example is the shopping complex at the Pentagon, which represents a significant innovation in how military institutions approach retail services for their personnel. Test your knowledge about this unique retail environment that serves America's military headquarters.

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The first military-exclusive credit card system (MilPay)
The Military Exchange Universal Product Code (MEUPS) barcode scanning system
Self-service commissary checkouts with military ID verification
Computerized inventory management for military uniforms and insignia