Nuclear material does not mean radioactive material, and the military knows the difference.
The crashes lead me to think that there's a hot war going on in Calif between white hat military and black hat military. I was planefagging the day of the Osprey crash, and saw a tanker orbiting LA for hours - look it up, pfs, which means there were lots of fighter jets and others buzzing around for that period, not just a S&R op.