With the miniaturization of Today's nukes. An F-15 or even an F-22 could be just as effective with "lethal" cargo as their larger cousins. It is not how many bombs you carry, or how big they are, but just getting to your enemy to drop the "egg" is the issue. An F-15e or a F-22A is more cost effective than a B-2 by hundreds of millions of $ -- and they can still penetrate! Really now, in a nasty WWIII enviroment, getting home isn't the issue. There will be no "home" to get to. Remember the B-2 was designed in 1988 to bomb the Soviet Union, not the Taliban, Al-Qaida or Serbia. For today's current USAF mission requirement, the B-2 is superfluous. Now if China or Russia started acting up.... that's another story.