The US announces it has developed the hydrogen bomb... today... 63 years ago.

Pull all western support from the ROK and see how long it takes the North to cross the DMZ.

As for the US bomb projects, hindsight would indicate that the MAD doctrine worked, since we are all still here and without the extensive development and production of these weapons and their delivery systems, there would have been no MAD so we may not have all survived into 2016.