re: US Senate Backs Bush on New Nuclear Weapons
There are always improvements in any kind of weapon.
Frankly, I think that the notion of a nuclear warhead penetrating a reinforced concrete bunker deep underground, staying intact, and then detonating seems to be preposterous. I just don't believe it would be possible.
On the other hand, very small warheads could prove useful in many scenarios. The smaller the weapon, the less damage. Ideal to use on North Korean military installations if NK should toss a nuke toward the SK. Such low-yield warheads would minimize civilian casualties.