OCEANOGRAPHIC Research Ships of CONRAD Class - James M. Gilliss -AGOR4- built in about 1962 was transferred to Mexico in 1982. The funnel contained not just diesel exhaust but space for silent running gas turbine. They also had "Pleuger" active rudder.
First major work she was used on was search for Thresher in 1963.
Never seen name on hull which did not correspond to in service name.