I have two thoughts here.
1)We did this knowingly to send a message to someone and then let it be leaked. (Iran, Russia, Islamakazis?)
2)If this was an accidental loading of Nukes, how is it the media found out?
It’s not like they are sitting on the Tarmac watching planes’ ordinance being loaded/unloaded.
Even if the reporters were watching, the missiles with concrete warheads look like the real thing to the untrained eye.