This test flight is launching on a Delta IV Heavy, which is a pretty well proven launch system (first time NASA's used it, though, AFAIK). Ultimately, Orion's

This test flight is launching on a Delta IV Heavy, which is a pretty well proven launch system (first time NASA's used it, though, AFAIK). Ultimately, Orion's supposed to be launched on NASA's new Space Launch System [1], but it's not ready yet. I believe the first scheduled test flight for Orion and SLS together is supposed to be sometime in 2017. [1] https://en.wikipedia.org/wiki/Space_Launch_System https://en.wikipedia.org/wiki/Space_Launch_System