ADSEC or ADSEC/COMZ represents "The Advance Section, Communications Zone", European Theater of Operations, United States Army, (ETOUSA) which was formally activated at Bristol in February 1944. It is commonly referred to as simply 'ADSEC'. This was a U.S. Army logistical agency, the first on the Continent. Upon its creation ADSEC was attached to the U.S. First Army, and gradually took over the Communications Zone activities. The agency moved forward with the Armies and provided close support. ADSEC provided detail planning for the invasion of Normandy, D-Day.