Built in 1967 at Burton Shipyard of Port Arthur, Texas (hull #407) as the Plato.
The tug was then acquired by Gulf Fleet Marine of Houston, Texas. Where she was renamed as the Gulf King.
Jackson Marine Corporation of Houston, Texas would later merge with Zapata Gulf Marine of Houston, Texas, as well as Gulf Fleet of Houston, Texas. The company became the largest shipping company in the world with a total of four hundred fifteen vessels. Tidewater Incorporated of New Orleans, Louisiana at that time had about two hundred seventy five vessels.
In the fall of 1986, Seahorse Marine of Lockport, Louisiana merged into Zapata Gulf Marine adding an additional ninety vessels to the fleet.
Seahorse Marine had been founded by the Arthur Levey family as Arthur Levey Boat Company after World War II. The company was later acquired by Petrolane Natural Gas of Belding, Mississippi. Where the company was renamed Seahorse Marine. In 1985, Petrolane was acquired by Texas Eastern of Houston, Texas. Which was a larger natural gas company. However, in the fall of 1986, Texas Eastern traded the company to Zapata Gulf Marine for an exchange of stock.
On January 15th of 1992 Zapata Gulf Marine merged with Tidewater Marine of New Orleans, Louisiana.
She was then acquired by McAllister Towing and Transportation of New York, New York. Where she was renamed as the Mark McAllister.
The tug has a certified ABS load line. She was repowered in 1999, with two EMD 16-645-E5 diesel engines with Philadelphia 28 HRMGH reduction gears at a ratio of 4.09:1 turning two 115(in) by 81(in) fixed pitch propellers for a rated 6,000 horsepower.
Her capacities are 78,000 gallons of fuel oil, 2,000 gallons of lube oil and 7,600 gallons of potable water.
The towing gear consists of an Almon Johnson double drum towing machine equipped with 2,100(ft) of 2(in) towing wire. The tug is outfitted with four fire stations.
In 2011, the tug was retired from service. However in 2014, the tug was scrapped.
(Captain Eric Takakjian)