Which military retail system pioneered the modern PX (Post Exchange) concept that revolutionized how military personnel accessed consumer goods and became one of the world's largest retail operations?

While we often think of military history in terms of battles and strategies, the retail aspect of military culture has evolved dramatically over centuries. From sutlers following armies with basic provisions to sophisticated modern military exchanges, retail has played a crucial role in maintaining morale and readiness. This trivia question explores a pivotal moment in military retail history that transformed how armed forces accessed consumer goods and established one of the most successful military-focused retail operations in history.

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The Army and Air Force Exchange Service (AAFES), established in 1895
The Royal Navy Purchasing Cooperative, founded in 1901
The Soviet Military Trade Network (Voentorg), formed in 1921
The Imperial Japanese Army Commissary System, created in 1912