Which retail innovation was first introduced by the Army & Air Force Exchange Service (AAFES) during the Vietnam War that revolutionized military retail operations?

The Post Exchange (PX) and Base Exchange (BX) systems have been crucial retail innovations supporting military personnel and their families for generations. These military retail establishments evolved from simple sutler wagons following troops to sophisticated retail operations. This poll tests your knowledge of how military retail innovation has developed to serve those who serve our country.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Mobile Field PX units that could quickly deploy to forward operating bases
The Military Star credit card program for service members
Online ordering system for troops deployed overseas
Commissary and PX combined shopping facilities