When deployed, the major warship and RFA vessel carry out the Atlantic Patrol Task (South) mission, which "provides a maritime presence to protect the UK's interests in the region". The Type 42 destroyer HMS "Edinburgh" took over the South Atlantic Patrol Task in October 2006, replacing HMS "Southampton". Prior to "Southampton's" deployment in August 2005, the role was filled by HMS "Cardiff", which was decommissioned on return to the UK. As of February 2010, the on-station warship was the Type 42 destroyer HMS "York". In late April 2010, HMS York was relieved by the Type 23 frigate HMS "Portland". In August 2010, HMS Portland was relieved by the Type 42 destroyer HMS "Gloucester". On 21 April 2011, HMS "York" arrived at the East Cove Military Port in the Falkland Islands, beginning patrol duties for the islands. October 2011 saw the arrival of the Type 23 frigate HMS "Montrose", generating a statement from UNASUR (Union of South American Nations). The Type 45 guided missile destroyer HMS "Dauntless" replaced HMS Montrose as of April 2012. In early August 2013, HMS Richmond was deployed to be the ship for the Royal Navy's Atlantic Patrol. HMS Portland was again deployed in January 2014 and HMS Lancaster deployed in 2015.