Which retail innovation did the Army & Air Force Exchange Service (AAFES) introduce in 2010 that revolutionized shopping for deployed troops in Afghanistan and Iraq?

Military base exchanges (PX/BX) have evolved dramatically from simple commissaries to modern retail environments. These stores serve military personnel and their families worldwide, offering tax-free shopping while generating funds for morale, welfare, and recreation programs. This poll tests your knowledge about a groundbreaking retail innovation that transformed how military personnel shop while deployed in combat zones.

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Tactical Mobile PX units - armored retail vehicles that traveled to forward operating bases
Exchange-in-a-Box - containerized retail stores that could be rapidly deployed to combat zones
Drone Delivery Service - using unmanned aerial vehicles to deliver retail goods to remote outposts
Digital PX Cards - prepaid retail cards that could be loaded remotely by family members back home