Re-designated as the IX Tactical Air Command in April 1944, its initial missions included interdicting transportation, disrupting communications and destroying warehouses and supply dumps in occupied France and the Low Countries in preparation for the Normandy Invasion in June.

Paying particular attention to German forces in the Falaise-Argentan Gap, targets were expanded to include tanks, vehicles of all types and troop formations.

Moving into north-central France, its groups attacked enemy targets near Paris and then concentrated its activity north-west across Belgium and into the southern Netherlands.

In December 1944 and January 1945 it engaged targets on the north flank of the Battle of the Bulge, then concentrated eastward into the Northern Rhineland as part of the Western Allied invasion of Germany.

The First Army halted its advance at the Elbe River in late April 1945 after which the wing engaged targets of opportunity in enemy-controlled areas until the fighting ended on 5 May 1945.