The job of the 320 th was to erect the hydrogen-filled barrage balloons over Omaha and Utah beaches, to defend the soldiers and landing crafts and protect against strafing from enemy aircraft.
Gwaith y 320fed oedd codi'r balwnau morglawdd llawn hydrogen dros draethau Omaha ac Utah, i amddiffyn y milwyr a’r cychod glanio a diogelu rhag ymosodiadau gan awyrennau'r gelyn.