Which innovative military retail strategy was first implemented during the American Civil War and later evolved into today's modern PX/BX system?

The Post Exchange (PX) system revolutionized military retail and supply chain management. Since its inception, these military department stores have provided essential goods and services to service members and their families worldwide, often in remote locations or combat zones. Beyond convenience, the PX system represents one of history's most unique customer loyalty programs and retail innovations, with profound effects on military morale and readiness. Test your knowledge about this distinctive military retail operation!

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Sutler system - civilian merchants authorized to sell provisions to troops
Victory Stores - government-run shops selling rationed goods to boost morale
Garrison Markets - traveling merchants following army movements
Quartermaster Exchange - officer-operated trading posts for enlisted men