Built in 1953, by National Steel and Shipbuilding Company of San Diego, California (hull #222 / LT 2075) as the LT-2075 for the United States Army.
In 1994, the tug was sold and renamed as the Marauder.
In 1992, she was acquired Foss Maritime subsidary Sort Well, Incorporated. a division of AmNav of San Francisco, California. Where she was renamed as the Marine Exporter.
The tug was eventually transferred to Foss Maritime of Seattle, Washington. Where she was renamed as the Cygnus.
In 2006, Foss Maritime acquired Constellation Maritime of Manchester, Massachusetts. The Cygnus was transferred to operations in Boston.
Rebuilt in 2006, she is powered by two EMD 16-645 Turbo diesel engines for a rated 5,000 horsepower.
In 2010, she was acquired by Krause Marine Towing of Parry Hall, Maryland. Where she was renamed as the David M. Krause.
The tug's capacities are 35,000 gallons of fuel, 400 gallons of lube oil, and 3,250 gallons of water.