 Complete the following phrase:  At the start of 1987, Derwents homeport was changed to in Western Australia. As part of the change of homeport, the ships company was swapped with that of sister ship . The ships first assignment in Western Australia was in support of the 1987 Americas Cup. After exercises and a brief refit, Derwent and were deployed. En route, Derwent assisted the yacht Aussiedan, which was experiencing engine troubles off Shark Bay. On Derwents return to Australia, she participated in exercises with visiting United States Navy ships, and escorted the First Fleet Re-enactment Voyage as it entered Fremantle. On Australia Day 26 January 1988, Derwent was involved in 