Which military retail innovation was first introduced during the American Civil War to improve troop morale and reduce desertion rates?

The Post Exchange (PX) system revolutionized how military personnel access consumer goods. These military department stores have evolved dramatically since their inception, bringing civilian comforts to service members worldwide while generating funds for morale, welfare, and recreation programs. How well do you know the history and impact of this unique military retail innovation that bridges military necessity with consumer culture?

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The Post Exchange (PX) system, allowing soldiers to purchase goods at regulated prices
Military Commissaries, focused exclusively on discounted food supplies for soldiers' families
The Military Clothing Sales Store, providing standardized uniform components
The Armed Forces Recreation Centers, offering vacation accommodations for military personnel