Which military retail innovation was first implemented by the Army & Air Force Exchange Service (AAFES) during the Vietnam War that revolutionized how soldiers shopped?

The Post Exchange (PX) system is one of the oldest and most successful retail operations connected to military history. Established to serve military personnel and their families, these stores have evolved from frontier trading posts to sophisticated retail operations. This poll tests your knowledge about this unique retail system that has supported troops for generations while pioneering retail innovations.

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Mobile field PX units that followed combat units to provide retail services near the front lines
The Military Star Card credit system allowing soldiers to purchase goods without carrying cash
Helicopter-based delivery services for remote outposts
Direct shipping of personal care packages from stateside PX locations to deployed soldiers