Seems to be a major rebuild in 2005, using part of the hull of former offshore tug/supply ship KIRKE I ex-VENUS DEL GOLFO ex-GULF FLEET NO.17, together with her pair of EMDs. Originally built by Quality Equipment Inc, Houma LA (Yd 133).

Before conversion she was 185grt, 57.9 x 12.5 x 4.9m
Now 95gt, 23.2 x 12.5 x 4.9m

I suppose that the conversion was done by Delta Tug Co's own shipyard. She has kept her original IMO number, but been given a new USCG No 1180110.

Here is the info i have on her Built in 2005, by Delta Boatworks, Incorporated of New Orleans, Louisiana as the Lejend for the Delta Tug Company of New Orleans, Louisiana

In 2005, the tug was acquired by the Crescent Towing and Salvage Company Incorporated of New Orleans, Louisiana. Where the tug was renamed as the Noon Wednesday.

The tug's name originated from Crescent Towing and Salvage Executive Ervin Cooper. Who played golf at noon every Wednesday. And, that he would not be in the office at that time.
He named the boat Noon Wednesday. to remind all of the Crescent Towing and Salvage Company employees.

Powered by two EMD 16-645 diesel engines. With Reintjes WAV 2600 reduction gears, at a ratio of 4:1. Turning two four bladed, fixed pitch, 114(in) by 84(in), stainless steel propellers mounted in kort nozzles. For a rated 4,500 horsepower.

Her electrical service is provided by two 75 kW Delco generators, driven by two Detroit Diesel 6-71 diesel engines. The tug's capacities are 30,000 gallons of fuel, 2,000 gallons of water, and 1,000 gallons of lube oil.

Her deck equipment consists of a McElroy CME single drum escort winch. Outfitted with 400(ft) of 7(in) line. Powered by a 30 horsepower motor.

Was she rebuilt at some point? Looks too modern, or better to say ODD, for 1976...