Which military branch first established the official Post Exchange (PX) system that revolutionized retail services for American military personnel?

The modern military shopping experience has a fascinating history that revolutionized retail for service members. Post Exchanges (PX) and Base Exchanges (BX) have been vital to military morale and welfare for generations, offering tax-free shopping and familiar products to deployed personnel worldwide. This poll explores the corporate history behind this unique retail innovation that continues to serve military communities today.

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The U.S. Army, which created the first official Post Exchange in 1895
The U.S. Navy, which established the Ship's Service in 1909
The U.S. Marine Corps, which founded the Marine Corps Exchange in 1897
The U.S. Air Force, which created the Base Exchange system in 1947