Despite air raids, a submarine attack, and casualties among sister ships, she commenced off-loading supplies on D-Day, 8 November, at Fedhala, French Morocco.

Mission accomplished, the cargo ship returned to Hampton Roads, Virginia, on 24 November and began preparations for a Pacific voyage.

As part of Assault Group II preparing for the invasion of Southern France she practiced landings until 13 August along both the Algerian and Italian coasts.

After five additional logistic missions from Oran and Naples, the attack transport joined a convoy en route to the United States late in October.

With other units of Amphibious Group 7 she helped to take Kerama Retto late in March and joined the attack on Okinawa on 1 April.

In the post-war years, Oberon served with the Navy Transportation Service carrying cargo and personnel between the West Coast and American bases in the Pacific.