When was the first official Army Post Exchange (PX) established in the United States military?

The military Post Exchange (PX) system has been a cornerstone of military retail for generations, providing essential goods and a touch of home comfort to service members worldwide. This retail innovation has evolved dramatically since its inception, becoming a unique aspect of military life and culture. Test your knowledge about the history of this distinctive military retail institution!

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1895, during the Spanish-American War preparations
1917, as part of World War I mobilization efforts
1862, during the Civil War to support Union troops
1941, following the attack on Pearl Harbor