Built in 1971, by Halter Marine Services Incorporated of New Orleans, Louisiana (hull #314) as the Mister Harold 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 2002, Tidewater Marine Incorporated renamed the tug as the Harold.
In 2005, the tug was acquired by Captain Arthur Fournier of the Fournier Towing and Ship Service of Belfast, Maine. Where she was renamed as the Escort.
In 2006, she was acquired by the McAllister Towing and Transportation Company of New York, New York. Where the tug was renamed as the Michael J. McAllister.
Powered by two, twelve cylinder, Alco 12-251 F diesel engines. With Lufkin reduction gears, at a ratio of 5.6:1. Turning two, cast steel, fixed pitch, propellers. For a rated 4,100 horsepower.
Her electrical service is provided by two, 98kW generator sets. The tug's capacities are 134,5000 gallons of fuel oil, 2,000 gallons of lube oil, and 23,300 gallons of potable water.
The tug's towing equipment consists of an INTERcon, double drum, towing winch. Equipped with 2,400(ft) of 2(in) towing wire, on each drum. As well as, an additional New England Trawler X1510 capstan.
(Captain Eric Takakjian, Kyle Stubbs, Captain Brian Fournier)