The second stage of the Earth launch vehicle will be one of two spacecraft that, unusually, will also serve as upper stages during the launch.
Both spacecraft, unusually, would also serve as upper stages during the launch. The second stage of the Earth launch vehicle was to have been one of two spacecraft that would be used on the launch vehicle.
The second stage of the Earth launch vehicle was to have been one of two spacecraft that would be used on the launch vehicle. Both spacecraft, unusually, would also serve as upper stages during the launch.
The second stage of the Earth launch vehicle was to have been one of two spacecraft that would be used on the launch vehicle. Both spacecraft, unusually, would also serve as upper stages during the launch.