Sources report #NASA looking at using the EM-2 SLS launch vehicle for EM-1 mission due to hydrogen tank issues on EM-1 vehicle @NASA_SLS— NASA Watch (@NASAWatch) May 15, 2017
Sources report #NASA looking at using the EM-2 SLS launch vehicle for EM-1 mission due to hydrogen tank issues on EM-1 vehicle @NASA_SLS