Which retail innovation was first implemented by the U.S. Army in 1895, revolutionizing how soldiers could purchase personal items regardless of their deployment location?

The military retail system has evolved dramatically over the centuries, from simple commissaries to today's complex Post Exchange (PX) operations. These retail innovations have significantly impacted military life and morale. This trivia question explores a key retail innovation that transformed how military personnel access consumer goods during deployments and on bases worldwide.

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The Army Exchange Service (AES) catalog ordering system
Self-service commissaries with standardized pricing
Military credit cards with deployment-adjusted spending limits
Mobile canteen trucks with rotational inventory systems