Comment: Re:What advances have we made? (Score 2) 447
The Cobra is a widely used and available helicopter. The US uses the chassis for forest fighting: they aren't exactly difficult to find or examine closely. They probably could have bought one on the open market (maybe even indirectly from the US itself). Nuclear weapons are slightly harder to find.
However, with that said, the problem with building a nuclear weapon has never been (not for 40-50 years or so) the design. That is actually quite easy, most physics graduates could probably design you one. The basic design of basic nuclear weapons* is pretty simple, once you know what you are doing. You can find sketch-ups on Wikipedia. The problem is getting refined nuclear material that actually works in a nuclear weapon, and more importantly, actually testing the weapon. Easy to do for a helicopter: very difficult for a nuclear weapon.
*NB: thermonuclear weapons are a considerably different, and considerably more difficult, story. But they don't really need those.