USNS Pollux (T-AK-290), later T-AKR-290, the fourth United States Navy ship of the name, is an Algol-class vehicle cargo ship that is currently maintained by the United States Maritime Administration as part of the Ready Reserve Force (RRF) as SS Pollux (T-AKR-290).

On 1 October 2007, the United States Maritime Administration began operating all eight FSS.

[5] Pollux's conversion into a vehicle cargo ship began on 28 July 1984 at Avondale Shipyards in New Orleans, Louisiana.

On 1 October 2008, she was transferred to the Ready Reserve Force, losing her "USNS" designation, and laid up at Philadelphia, Pennsylvania.[8][9].

In 2014 the vessel and her sister SS Regulus were relocated to the United States Maritime Administration Beaumont Reserve Fleet where they remain in ROS-120 status.