Which innovative retail promotion technique was first widely adopted by military Post Exchanges (PX) during World War II that revolutionized how soldiers shopped?

Military Post Exchanges (PX) have been vital retail establishments serving troops since the 1800s. These unique retail environments have evolved dramatically over time, adapting marketing strategies and product offerings to serve military personnel across generations and conflicts. Test your knowledge about how military retail has transformed throughout history and the innovative marketing techniques used to reach this specialized consumer base.

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Self-service shopping (allowing soldiers to select their own merchandise rather than requesting items from clerks behind counters)
Mail-order catalogs featuring specialized battlefield equipment
Radio advertising campaigns promoting exclusive military brands
Installment payment plans for higher-priced items like watches and cameras