Which conflict prompted the U.S. military to formalize and expand the Post Exchange (PX) retail system that continues to serve troops today?

The Post Exchange (PX) system has been a crucial retail network for military personnel and their families for generations. These specialized stores provide tax-free goods and services on military installations worldwide, boosting morale and providing a touch of home for deployed troops. Test your knowledge about this unique military retail institution that has evolved from simple sutler wagons to modern shopping complexes.

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• Spanish-American War (1898)
• World War I (1917-1918)
• Vietnam War (1955-1975)
• Civil War (1861-1865)

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