The first SLS flight, around the moon, will not include a crew.
http://www.space.com/36823-nasa-astronauts-wont-fly-first-sls-megarocket.html [space.com]
https://www.bloomberg.com/news/articles/2017-05-12/nasa-study-warns-against-putting-crew-on-huge-rocket-s-first-flight [bloomberg.com]
https://mobile.nytimes.com/2017/05/12/science/nasa-trump-request-moon-new-rocket.html?referer=https://news.google.com [nytimes.com]
SpaceX might beat SLS to the moon with humans.
Previously: https://soylentnews.org/article.pl?sid=17/02/28/0252250 [soylentnews.org]
https://soylentnews.org/article.pl?sid=17/04/30/2011223 [soylentnews.org]