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Crowley’s fleet of Invader-class tugs, likeStalwart, pictured here, are true displacementhulls with loaded draft of 20 feet, a pair of20-cylinder EMD engines generating 75 tonsof bollard pull. Stalwart can be seen here withmore than 50 large tires for fendering.the barges were constructed at BayShipbuilding, in Sturgeon Bay, Wis.Halter subsequently went througha few restructurings and emergedas VT Halter Marine, after whichCrowley signed them to build the 650series of tugs and barges.In 2006, the 650-class was introducedwith the 127-foot PacificReliance and Gulf Reliance, pushing587-foot, 185,000-bbl barges. “Webuilt the boats in this series identicalto the first four boats,” said EdSchlueter, vice president of vesselmanagement services for Crowley.Schlueter explained that theylengthened the barges for the 650s,and increased their capacity to185,000 barrels by adding an extratank to the center of the 155,000-bblbarges.Then, for the next eight boatsin the series, Crowley switchedto heavy-fuel oil (HFO) Wärtsiläengines to take advantage of themuch lower cost of that fuel. Thosetugs, in order of delivery, are Resolve,Integrity, Courage, Commitment, Pride,Achievement, Innovation and soon,Vision. However, all of the HFO boatshave the ability to switch to light fuelsin order to comply with near-coastoperations and port entry regulations.12 American Tugboat Review 2011