> By way of comparison, the one-time propulsion leader in the United States, Aerojet Rocketdyne, has set a goal of building four RS-25 rocket engines for NASA's

> By way of comparison, the one-time propulsion leader in the United States, Aerojet Rocketdyne, has set a goal of building four RS-25 rocket engines for NASA's Space Launch System a year. SpaceX is now building at least four Raptor rocket engines a week. The two engines are comparable in terms of their overall power. What SpaceX is doing is truly incredible. They have literally years of advance on their closest competitors, and are overperforming over any other rocket company, be private or government sponsored, to such a degree it's no contest. All happening right here in America, by an all American team.