Which military retail innovation was first introduced during World War II and revolutionized how soldiers accessed everyday products on the frontlines?

The Army & Air Force Exchange Service (AAFES) and Navy Exchange (NEX) have been vital parts of military life for generations, providing retail services to servicemembers worldwide. These stores have evolved from simple commissaries to modern retail experiences with unique brand identities. This poll tests your knowledge about the history and development of military retail operations that have supported troops from World War II to modern conflicts.

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PX Mobile Units (truck-based stores that could follow advancing troops)
The Green Line (premium organic products sourced from military-owned farms)
Combat Credit Cards (the first military-specific payment system)
Tactical Vending Machines (armored automated retail stations)