[1] Beaver State was laid down on 13 April 1964, as the break-bulk freighter, SS Mormacdraco, ON 299008, IMO 6507921, a Maritime Administration type (C4-S-60a) hull, under MARAD contract (MA 144).

She was sold to United States Lines in 1983 and renamed SS American Draco, 13 September.

US Lines ceased operations in 1986 and the ship was turned over to the MARAD on 2 April 1987 and placed in the National Defense Reserve Fleet (NDRF).

Conversion resumed in 1992, but was not completed by National Steel and Shipbuilding Co., San Diego, CA until 4 May 1997, when she was placed in service as SS Beaver State (T-ACS-10) and assigned to the Ready Reserve Force (RRF), under operation control of the Military Sealift Command (MSC).

to an X-Band Transportable Radar Ship, designated (XTR-1) and renamed SS Pacific Tracker, 1 April 2009.