> SLS from ULA Just one note on that: Boeing is the company building the SLS core stage, not ULA. While ULA is partially owned by Boeing (joint venture between

> SLS from ULA Just one note on that: Boeing is the company building the SLS core stage, not ULA. While ULA is partially owned by Boeing (joint venture between Boeing and Lockheed Martin), they operate independently. ULA can't quite match SpaceX for style or cost these days, but they are consistently much better at what they do than Boeing is. Their launch success record is extraordinary, and their rockets provide certain capabilities that Falcon 9 and Heavy can't match without adding a kick stage to the payload.