Which revolutionary retail concept did the U.S. Army Post Exchange (PX) system introduce in 1895, decades before it became standard in civilian retail?

The Post Exchange (PX) system has been a crucial part of military life for generations, providing essential goods and services to service members worldwide. But this retail institution has evolved dramatically since its inception, introducing innovations that sometimes preceded their civilian counterparts. Test your knowledge about this unique military retail operation that has supported troops from remote outposts to major bases throughout military history.

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Self-service shopping format
Mail-order catalog distribution
Fixed pricing with printed price tags
Store credit card system