 In January 1962, after his tour aboard "Pioneer" ended, Nygren was originally scheduled for a tour in Washington, D.C., but instead was transferred on short notice to duty with the United States Department of State, which was just starting to fulfill Antarctic Treaty requirements to send U.S. representatives with foreign expeditions to Antarctica.He boarded the Danish ship "Kista Dan" at Montevideo, Uruguay, for transportation to the Falkland Islands (also known as the Malvinas), where he transferred to the British research ship RRS "Shackleton".He served aboard "Shackleton" and the British research ship RRS "John Biscoe" as U.S. representative to the British Antarctic Survey until May 1962, visiting all the bases along the coast of West Antarctica as well as the Argentine Islands, South Georgia Island, and the Falklands (or Malvinas).