SS Cape Island (AKR-10) was originally laid down for commercial service in 1976 as Illinois, a Type C7 ship for the States Lines.

It was eventually transferred to the Naval Vessel Register (NVR)[1] as the USNS Mercury, as a transport ship for vehicles, and other goods.

In 1993 the ship was permanently transferred to the navy's ready reserve force, and renamed Cape Island (T-AKR-10).

The Cape Island remains laid up in a ready reserve state so that it may be activated in five days, if called upon.

As of 9/12/23, SS Cape Island is undergoing sea trials in the Strait of Juan de Fuca.