In which war did the U.S. military first formalize the Post Exchange (PX) system that revolutionized retail services for troops?

The modern military exchange system has a fascinating corporate history that dates back over a century. These retail establishments serve military personnel and their families worldwide, offering products at competitive prices while generating funds for military welfare programs. Today's Post Exchanges (PX) and Base Exchanges (BX) represent one of the largest retail operations in the world, with a unique business model and customer loyalty system specifically designed for the military community.

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• American Civil War (1861-1865)
• Spanish-American War (1898)
• World War I (1914-1918)
• Philippine-American War (1899-1902)

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