How long did the 369th serve in combat

191 days!

Explanation:

All told, the 369th spent 191 days in combat, longer than any other American unit in the war. The U.S. Army Center of Military History (CMH) credits them with participation in the Champagne-Marne, Meuse-Argonne, Champagne 1918, and Alsace 1918 campaigns. The regiment also received the French Croix de Guerre with Silver Star.

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