NOAA’s largest oceanographic research vessel, Ronald H. Brown, is based in Charleston, SC, although if you haven’t seen her in her homeport for quite a while, you are not alone. She only recently returned from a record deployment of 1,347 days, which is to say 3 years, 8 months and 7 days in service. During the lengthy deployment, the research vessel spent nearly 800 days at sea and traveled nearly 130,000 miles conducting scientific research and servicing buoys that collect a wide variety of environmental data.
From the NOAA press release: