欧州補給機
However, in 2004, it was already anticipated that the European Automated Transfer Vehicle (ATV) and Japanese H-IIA Transfer Vehicle (HTV) would be introduced into service before the end of ISS Assembly. As of 2004, the US Shuttle transported the majority of the pressurized and unpressurized cargo and provides virtually all of the recoverable down mass capability (the capability of non-destructive reentry of cargo).