Which retail innovation was FIRST introduced by the U.S. Army & Air Force Exchange Service (AAFES) specifically to boost morale for deployed troops during combat operations?

Military exchanges (PX/BX) have been crucial to troop morale and welfare since their inception. These retail operations have evolved from simple sutlers' wagons following armies in the field to modern department store-like facilities serving military communities worldwide. This poll tests your knowledge of how military retail innovations have shaped service member experiences throughout history.

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Tactical Field Exchanges (TFEs) - mobile retail units that could follow troops into combat zones
Military-exclusive clothing brands (like the 'BDU Collection') designed to create brand loyalty among service members
The 'Combat Catalog' mail-order system allowing troops to order items from stateside exchanges
PX Smartphone App with GPS-enabled ordering for delivery to forward operating bases