space.com: As of 2016, NASA had planned for the SLS' first flight to take place in 2018, without a crew on board. By Calla Cofield
'But the transition team that the Trump administration sent to the agency earlier this year asked for an internal evaluation of the possibility of launching a crew atop the SLS inside the agency's Orion space capsule.
'Robert Lightfoot, NASA's acting administrator, said during a news conference today that, based on the results of this internal evaluation, a crewed flight would be "technically feasible," but the agency will proceed with its initial plan to make the rocket's first flight uncrewed.
'The internal evaluation "really reaffirmed that the baseline plan we had in place was the best way for us to go," Lightfoot said. "We have a good handle on how that uncrewed mission will actually help [the first crewed mission of SLS] be a safer mission when we put crew on there."'