Earlier quoted context omitted.
A rocket- according to US employment policy- is a missile fired in a funny direction. So you need to be a citizen with a security clearance to work for any US aerospace company. This makes the cold shoulder a little more understandable, because they couldn't legally hire you even if they wanted to.
It is NOT true that you have to be a US citizen to work for a US aerospace company. Your comment can dissuade people from applying to jobs. It is true that there may be certain projects within a company that you cannot work on as a foreigner, and because of that it can be harder to get hired. But there are many foreigners who work at places like SpaceX, NASA, etc. For "sensitive country" foreign nationals (you can Go…
But I think it's fair summary to say that if you are neither a citizen or a permanent resident, you have a damn tough hill to climb [3].
[1] https://www.quora.com/How-can-non-U-S-citizens-work-for-NASA...
[2] https://en.wikipedia.org/wiki/International_Traffic_in_Arms_...
[3] https://www.inverse.com/article/21487-elon-musk-spacex-forei...