the European Economic Community to acquire five additional vessels, four of which were eventually built. Meanwhile, the former Irish lights vessel Isolda was purchased to act as a training ship, bearing the pennant number A15 and renamed . It served until being sold for scrap in 1984. A Danish stern trawler Helen Basse was also leased for a year, serving under the name LÉ Ferdia, pennant number A16. The 50th anniversary of the Naval Service took place in 1996. Celebrations included a fleet review by President Mary Robinson. In 1999, a new ship was delivered to the Naval Service, marking the beginning of a new class of larger patrol vessels followed by , commissioned in September 2001 replacing LÉ Deirdre. While most missions undertaken by the Naval Service are in Irish waters, on occasion longer missions are undertaken in support of Irish peacekeepers serving with the United Nations, representing Ireland, or in support of Irish trade missions. In 2002, LÉ Niamh delivered supplies to Irish troops in Eritrea, then continued on a trade promotional tour to India, Malaysia, Singapore, Hong Kong, China, Korea, and Japan, becoming the first Irish naval vessel to cross the Equator. In 2006 travelled to Argentina, attending ceremonies connected with the 149th anniversary of the death of Irish-born Admiral William Brown, founder of the Argentine Navy, and also visited ports in Uruguay and Brazil. In 2010, Niamh travelled to the Americas, visiting Brazil, Argentina, Chile, Mexico and the United States. In 2010, two new ships were planned for the Naval Service. The first, , was delivered in April 2014 replacing LÉ Emer, and the second, LÉ James Joyce, replaced LÉ Aoife in 2015. The option for a third, LÉ William Butler Yeats, was exercised in June 2014 and commissioned in October 2016. The new ships displace over 1,900 tons, have a top speed of 23 knots, a range of 6,000 nautical miles. They are armed with an OTO Melara 76 mm/62, and have a longer deck area that can accommodate deep-sea search-and-rescue submarines and unmanned aircraft. In May 2015, it was announced that the Naval Service would deploy a ship to the Mediterranean to form part of the EU humanitarian response to the European migrant crisis. The fleet flagship, Eithne, left Cork on 16 May 2015 for an eight-week deployment to the region, during which time the ship picked up a total of 3,377 people in