Which retail innovation was FIRST introduced by the Army & Air Force Exchange Service (AAFES) during the Vietnam War to improve morale among deployed troops?

The Post Exchange (PX) system has been a crucial part of military life for generations, providing essential goods and services to personnel stationed worldwide. This retail operation has a fascinating history of innovation and expansion that many civilians never experience. Test your knowledge about how this unique military retail system evolved to support troops through wars, peacetime, and changing global deployments.

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Mobile PX units that could follow front-line troops with essential supplies
Military-exclusive credit cards that allowed soldiers to purchase goods on credit while deployed
Catalog shopping services with direct shipping to combat zones
Self-service department stores replacing traditional counter service on major bases