Built in 1968, by Halter Marine Incorporated of New Orleans, Louisiana (hull #194) as the Mister Lou for the Jackson Marine Corporation of Houston, Texas.

The Jackson Marine Corporation was owned by the Halliburton Corporation of Houston, Texas. The company owned a total of ninety vessels. Consisting mainly of offshore tugs, and supply vessels. With some chemical transport and well stimulation vessels.

In 1985, Zapata Marine Service, Gulf Fleet Marine Incorporated, and Jackson Marine Services merged to form Zapata Gulf Marine Service Incorporated of Houston, Texas. Where the tug retained her name.

In 1992, Zapata Gulf Marine Incorporated merged with Tidewater Marine Incorporated of New Orleans, Louisiana. Where the tug retained her name.

In 1997, the tug was acquired by Iranian interests. Where she was renamed as the Mehdi-2. Her current and or final disposition is unknown. She was a twin screw tug, rated at 1,700 horsepower.
(Captain Eric Takakjian, Kyle Stubbs)