Built in 1965, by Main Iron Works Incorporated of Houma, Louisiana (hull #157) as the A.J. Cenac for the Cenac Towing Company Incorporated of Houma, Louisiana.
In 1994, the tug was acquired by Catcor Services Incorporated of Utuado, Puerto Rico. Where she was renamed as the Sam B.
In 2014, she went out of documentation. Her current, and or final disposition is unknown. She was a single screw tug, rated at 1,000 horsepower.