Akirasho wrote:... an interesting aside... the US quit making "super bombs" (the former Soviets made a handfull) when it was discovered that from tactical POV, the extra energy in their explosion was essentially wasted and caused no more damage to a target area than a smaller one...
MIRVs with subs are what it is all about nowadays on the nuclear front.
Seems once they came up with MIRVS nuclear armament development slowed down a fair bit. Trident II is broadly the same idea they had by the '70s. Beyond that nuclear weapons are a bit irrelevant. OK - so you can annihilate the world - even if your nation has already been annihilated itself. Why evolve that further?
They have no military purpose.
The reason it seems you still have them is that the MAD doctrine still exists. You try this and you WILL be annihilated, even if we are too. http://www.youtube.com/watch?v=Z5o8d62bFUA