Built in 1976, by Halter Marine Services Incorporated of New Orleans, Louisiana (hull #538) as the Gulf Brent for Gulf Mississippi Marine Incorporated of Houston, Texas.
In 1978, Gulf Mississippi Marine Incorporated became Gulf Fleet Marine Incorporated of Houston, Texas. Where the tug retained her name.
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, the tug was acquired by the Crosby Marine Transportation Company of Golden Meadow, Louisiana. Where she was renamed as the Crosby Endeavor.
Powered by two, EMD 20-645E7 diesel engines. With Reintjes WAV 4800 reduction gears, at a ratio of 5:1. Turning two, four bladed, 138(in) by 109.5(in), stainless steel, fixed pitch propellers, mounted in kort nozzles. She is a twin screw rated at 7,200 horsepower. The tug is also oufitted with a Bird Johnson, bow thruster. Driven by a single, dedicated GM 1271TA diesel engine.
Her electrical service is provided by two, 150kW generator sets. Driven by two, GM 8V-71 diesel engines. The tug's capacities are 224,500 gallons of fuel oil, 8,700 gallons of lube oil, 41,950 gallons of cargo water, and 16,000 gallons of potable water.
The tug's towing gear consists of a double drum, INTERcon 75091, towing winch. Outffited with 6,000(ft) of 2.5(in) towing wire on each drum.
(Captain Eric Takakjian, Kyle Stubbs)