USS Jamestown (AGTR-3/AG-166) was an Oxford-class technical research ship acquired by the U.S. Navy for the task of conducting research in the reception of electromagnetic propagations. The third ship to be named Jamestown by the Navy, AG-166, a converted Liberty ship, was launched as J. Howland Gardner under Maritime Commission contract by New England Shipbuilding Corp., South Portland, Maine, 10 July 1945; and sponsored by Mrs. George W. Elkins of Newport, Rhode Island.