Sure the buttons could have been named something different, but with a confirmation box, this UX passes what should be considered reasonable to prevent a literate and aware individual (the only type that should be approved for this position) from making a mistake like this.
I'm really astonished at the need to defend my position on this... it's almost like everyone replying here is thinking that they, too, would treat a legitimate missile defense drill (in the era of saber-rattling between Trump and Kim) the same way they treat installing a software EULA or an update to their FB ToS.