Why they are "not supposed to do that"?
May be it worth to explore their site and portfolio?
Could be that they're promoting development of the aircraft to a wider audience, but still, isn't the NGAD still a top secret project, and that hiring is usually done in secret for such a sensitive project? Who knows which person with bad intentions may decide to join such a company to possibly disrupt the program or worse, give information to the enemy? I can only hope that security for the NGAD program is sealed so tight that such incidents are not going to happen, ever. Especially since some of the US' top secret stuff can be easily leaked by hackers (Or an average person on the War Thunder Forums) nowadays.
Also, I did check their portfolio after I posted that, just to see for myself, and they do focus on systems development, meaning they make the computer and avionics systems for certain military technologies, so they are legit in what they do. They have a history of providing the systems for military technology, especially aerospace technologies, so I'll give them the benefit of the doubt here, and say that they probably know what they're doing when they did that.
I just find it concerning that they're advertising a chance to work on the NGAD program like it's your usual job fair. Maybe that's just how I see such programs, but that kind of thing should have been a private kind of affair, not promoting it like this, as it helps improves security if less people join it and become a part of the development team. If I recall, that kinda one of the principles of worker numbers at Skunk Works, as the less people are involved, the more likely that the program will not be leaked out, and thus the more secure it will be overall
And yeah, someone might say that "Isn't it just the same as news about NGAD being shared online from time to time? Don't both promote the NGAD publicly?", I would say yes to that, but the former is news on the NGAD, and it's needed for transparency's sake, but this one is like an invitation, and it's bound to bring in various types of people who have the skills required. The problem would be if said persons have the desire to actually follow the information protocols and keep their involvement in the program top secret, and instead, find various ways to share some detailed information out to the public. That would be a cause for security concerns if found out, and undermine the program security of not just the NGAD, but every other classified projects involved, and I for one, don't want that to happen to the NGAD.
