Which wartime innovation led to the official establishment of the modern Army Exchange Service system that eventually evolved into today's AAFES (Army & Air Force Exchange Service)?

Beyond battlefields and strategies, military history also encompasses the evolution of retail services for troops. The Army & Air Force Exchange Service (AAFES) has a fascinating corporate history dating back to the 19th century, when military commanders recognized the need for organized retail operations to support troops with essential and comfort items. Test your knowledge about this unique military retail institution that has served American forces through multiple conflicts and continues to operate worldwide today.

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Post trader stores during the American Civil War
World War I canteen systems created by the War Department in 1917
Frontier trading posts during the Indian Wars of the 1870s
Naval ship stores established during the Spanish-American War