 She towed the BOF vessel USFS "Widgeon" from Woods Hole to Hampton Roads, Virginia, arriving there on 25 November 1921.During March and April 1922, "Halcyon" was at Newport, Rhode Island, spending little time at sea but conducting work in support of flatfish studies by the Woods Hole station.She spent June 1922 preparing for a cruise to study currents, and by 30 June 1922 had steamed a total of over the preceding year.