Which war saw the first official establishment of the Army Exchange Service (the predecessor to today's Army & Air Force Exchange Service) as a formalized retail operation for troops?

The Post Exchange (PX) system revolutionized military retail operations and logistics by providing soldiers access to necessary goods and comfort items while deployed. These retail operations have evolved dramatically from their humble beginnings to today's sophisticated global networks supporting troops worldwide. Test your knowledge about this unique military retail institution that has been crucial to troop morale for over a century.

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• American Civil War (1861-1865)
• World War I (1917-1918)
• Spanish-American War (1898)
• Philippine-American War (1899-1902)

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