Which retail innovation was first widely implemented in U.S. military exchanges before becoming common in civilian retail?

Military exchanges (PX/BX stores) have been vital to troop morale and welfare for centuries. These retail operations have evolved from simple sutler wagons following armies to sophisticated global retail networks with billions in annual sales. This poll explores how military retail operations developed unique strategies to serve personnel worldwide, influencing modern retail concepts like omnichannel distribution, controlled pricing, and global supply chain management.

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Universal price guarantees regardless of store location (same pricing in Alaska, Germany, Japan, etc.)
Self-checkout kiosks
Store-branded credit cards with rewards programs
Online ordering with in-store pickup