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ADSEC's mission was to support the U.S. First Army, U.S. Third Army, and U.S. Seventh Army by building bridges, roads and hospitals through France, Belgium and Germany.
The group continued operations on the continent providing tactical air support in support of U.S. First Army until V-E Day, being stationed at Bad Langensalza, Germany (ALG R-2) at the end of hostilities.