Which retail innovation, first widely implemented during the Vietnam War, dramatically improved product access for deployed troops and remains a cornerstone of military retail systems today?

Throughout military history, innovations in how soldiers access supplies and personal items have significantly impacted morale and combat readiness. Post Exchanges (PX) and their equivalents have evolved dramatically since their inception, introducing retail innovations that transformed military life. This trivia question explores a pivotal retail innovation that revolutionized how deployed service members could access products from home, boosting morale during major conflicts of the late 20th century.

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AAFES Mobile Field Exchange units that followed combat units with essential supplies
The Military Mail Order Catalog system allowing troops to order American products from overseas
The Combat Ration Debit Card system for electronic purchases of supplemental foods
Tactical PX Satellites that established mini-exchanges within 5 miles of any battalion-sized element