Which military retail innovation did the Army & Air Force Exchange Service (AAFES) pioneer during World War II that revolutionized frontline supply chains?

The military retail landscape has evolved significantly over the decades, providing essential goods and services to service members worldwide. The Army & Air Force Exchange Service (AAFES), also known as 'The Exchange,' is one of the largest retailers serving the U.S. military community. Test your knowledge about this unique military retail institution that combines military history and retail strategy in a fascinating blend of service and commerce.

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Mobile Post Exchanges (PX) that followed troops into combat zones
Satellite-based ordering systems for remote outposts
Submarine-based retail distribution centers
Aerial drone delivery of personal items to soldiers