About 20 iterative engine designs from the Rocketdyne A-1 to the F-1, building experience and skills along the way.
It's probably a myth anyway, Rocketdyne's expertise continues with the RS-68 and there are probably still employees that worked on the RS-56 that was derived from the H-1, which was essentially a smaller F-1
edit: Apparently, an upgraded F-1B is part of the SLS Block 2 spec anyway, so yes, they can still make them.
It's probably a myth anyway, Rocketdyne's expertise continues with the RS-68 and there are probably still employees that worked on the RS-56 that was derived from the H-1, which was essentially a smaller F-1
edit: Apparently, an upgraded F-1B is part of the SLS Block 2 spec anyway, so yes, they can still make them.