Built in 1985, by Eastern Marine, Incorporated of Panama City, Florida (hull #91) as the Winslow C. Kelsey for the Quincy Maritime Corporation / General Dynamics of Needham, Massachusetts.
Originally built to perform submarine assist duties for the General Dynamics corporation at their Electric Boat facility in Groton, Connecticut.
As a result of post cold war cutbacks the tug was either sold off or was chartered out under American Tugs, Inc. and served as an LNG assist tug in Puerto Rico under charter to South Puerto Rico Towing of Guayanilla, Pueto Rico.
Around 1997, the tug went on charter to the A.P. St. Phillip Company of Tampa, Florida. Where she retained her name. A.P. St. Phillip would later become Hvide Marine of Tampa, Florida.
When the charter expired in 2008, the tug was acquired by Portland Towboat, where she retained her name. She served as an escort/assist tug in the New England Area under the ownership of Fournier Towing of Belfast, Maine.
She is an ABS, A1 Towing, AMS classed tug powered by two EMD 16-645-E6 diesel main engines married with two Ulstein 1650 "z-drives" units fitted with 92(in) stainless steel propellers for a rated 4,300 horsepower.
Her electrical service is provided by two 175 KW 480V generators driven by two Detroit 8V-71 engines.
The tug's Capacities are 58,208 gallons of fuel oil, 911 gallons of lube oil, 10,000 gallons of ballast, and 7,692 gallons of water.
The towing gear consists of a Skagit 55 single drum towing winch outfitted with 2,400(ft) of 2.25(in) stainless steel wire with a line pull of 175,000 pounds. On her bow she is fitted with a Skagit capstan with a 10,000 pound line pull, she is also fitted with a second on the stern.
In 2012, the tug was acquired by McAllister Towing and Transportation of New York, New York. Where the tug was renamed as the Alex McAllister.