Stationed a short walk south of Rivet City, they decided to head to the nearby beached aircraft carrier and set up a new facility there, under the escort of Horace Pinkerton. On April 15th, 2239, this move was completed, and the Research Institute founded Rivet City.
The Naval Research Institute is mentioned only in Fallout 3.
↑The Lone Wanderer: "Setting the record straight is exactly my goal." Horace Pinkerton: "For that, you have to go all the way back to when remnants of the Naval Research Institute cleared the Mirelurks off this wreck about 40 years ago. We were looking for new lab-space, and this bucket of bolts just happened to have a well-preserved science bay on it. Everything else just grew up around that lab once we got it up and running. The science team was led by one "H. Pinkerton." (Horace Pinkerton's dialogue)