Which military retail innovation was specifically created during World War II to serve troops in remote combat zones with essential goods?

The Post Exchange (PX) system has been a crucial part of military life for over a century, providing soldiers with access to goods while deployed. These retail operations have evolved dramatically over time, from simple sutlers' wagons following Civil War troops to today's modern department store-like facilities on bases worldwide. This poll tests your knowledge about this unique retail history that has supported troop morale and readiness throughout American military history.

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The Ship's Store Ashore program
The Army Exchange Service (AES)
The Mobile PX units
The Military Star Card credit system