During World War II, which innovative retail logistics strategy did the U.S. Army implement to supply PX (Post Exchange) goods to troops across diverse combat zones?

The military has its own retail ecosystem that has evolved significantly over time. The Post Exchange (PX) system has been a crucial part of military life, boosting morale and providing essential goods to service members worldwide. This trivia question explores how this unique military retail network adapted during one of history's most significant conflicts. Test your knowledge about this interesting intersection of military history and retail logistics!

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Mobile PX trucks (called 'Rolling Exchanges') that followed combat units with standardized inventory
Airdrops of personalized PX packages based on pre-war civilian purchasing habits
Regional PX centers that manufactured all goods locally to avoid shipping challenges
Subscription-based system where soldiers pre-ordered PX items three months in advance