Which military retail innovation was first established during the Spanish-American War (1898) and revolutionized how soldiers accessed consumer goods during deployments?

The Post Exchange (PX) system has been a critical component of military life for generations, providing essential retail services to service members and their families worldwide. This unique retail model has evolved significantly throughout military history, adapting to changing warfare conditions, deployment patterns, and consumer needs. Test your knowledge about this distinctive military retail innovation that has impacted morale and military operations for over a century.

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The Army Exchange Service (AES), which created standardized mobile field stores
The Military Commissary System, which focused exclusively on food distribution
The Officers' Club Retail Network, which served only commissioned personnel
The War Department Supply Chain, which was civilian-operated in combat zones