PPTS (Prospective Piloted Transport System or Перспективная Пилотируемая Транспортная Система, Perspektivnaya Pilotiruemaya Transportnaya Sistema), unofficially called Rus, is a project being undertaken by the Russian Federal Space Agency to develop a new-generation partially reusable capsule manned spacecraft. Its official name is Пилотируемый Транспортный Корабль Нового Поколения, Pilotiruemyi Transportny Korabl Novogo Pokoleniya or PTK NP meaning New Generation Piloted Transport Ship. The goal of this project is to develop a new-generation spacecraft to replace the aging Soyuz spacecraft developed by the former Soviet Union and it is similar in design and function to the US Orion spacecraft. The PPTS project was started following the failed plans by Russia to co-develop Crew Space Transportation System (CSTS, until middle 2006 named ACTS) with Europe. Following this the Russian Federal Space Agency ordered the local space industry to finalize proposals for the new manned spacecraft.[5]