Looking at the proposed hardware (I'm a child of the Mercury era) for the return-to-moon mission proposal reminds me that there's nothing new here: big, expensive throw-away hardware.
The SLS program is aimed at two objectives: to toss SSME's into the Atlantic, and keep legacy aircraft firms in business.
I resent the shit out of my tax dollors being thrown away like this. If anyone needs to go to the moon, mars, or the asteroid-belt they can just pony up the money and hire SpaceX for the ride.
We need more aircraft-carriers, F-35's, and boarder-fences -- that's the job of the Federal government. Not this old-hat Buck Roger's BS.
NASA has not advanced the art of space travel with this system, they're just hiking down a well traveled path; a jobs program for engineer's who elected to bask in the security of a government gig. NASA has lost its fighting edge to PC, political changes in the wind, and institutionalized avoidance of reasonable risk.
SLS: been there, done that. It was called Apollo.