The US government did not build bombers, ICBMs, or even the Apollo vehicles. All of those were specified by agencies and contracted out to the same contractors that exist today. I think the last thing the US "manufactured" was ammunition during the Civil War, as it owned a few shot towers, but even the vast majority of those were privately-owned and contracted by the US Army.
(Though I was thinking more of the research/planning vs actually mass production, that you're taking about. Especially as this discussion is about such as case too, considering it's software)
