In 2005, the Saab Draken fleet was retired (50 years after the type first flew), to be replaced by the Eurofighter Typhoon. Before the first delivery of Typhoons, 12 F-5 Tiger II were leased from Switzerland as a stopgap measure. The Eurofighter purchase was subject to controversy in Austria, and became a political football for some time, but the 15th and final aircraft was delivered on 24 September 2009. As of 2017, possible corruption affairs surrounding the Eurofighter procurement are still being investigated by the Austrian parliament. In July 2017, as a result of the ongoing controversy, the Austrian Ministry of Defense announced the phasing out of the Typhoon starting 2020, and its replacement by a "militarily more effective and more cost-efficient" air surveillance system.