As of last December, $15 billion had been spent on the SLS program, according to NASA officials. Primary issues include challenges with program management, technical issues and contractor performance.
Boeing is providing the rocket’s core and upper stages.
In a statement to WFTV, Boeing said: "In partnership with NASA, Boeing is building the only rocket capable of safely and efficiently delivering humans and necessary hardware back to the moon. Such an undertaking has certainly had its cost and schedule challenges over the years, but the investment has paid off in bringing together the required talent, technology and tooling to build this unprecedented deep-space rocket."