Which military exchange system pioneered the first self-service retail concept for U.S. troops overseas during WWII, revolutionizing how soldiers shopped and creating the modern military retail model?

Military exchanges (PX/BX) have been a crucial element of military life for generations, providing tax-free shopping and familiar brands to service members worldwide. These retail operations have evolved from simple commissaries to billion-dollar retail enterprises with unique branding and marketing strategies. Test your knowledge about this distinctive military retail ecosystem that has influenced both military culture and civilian retail practices.

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Army Exchange Service (AES)
Navy Ship's Service
Marine Corps Exchange (MCX)
Royal Military Canteen Service