I'm unclear on what you mean by this.
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If we get hit with WMD out of Baghdad, we cannot retaliate "in-kind"
At least not ON Baghdad. However, just as we determined in WWII that more lives would be saved and the war would be shortened by at least six months by nuking Nagasaki and Hiroshima, THAT option would be wide open on any remaining large pockets of eneemy forces.
The problem with THAT is there essentially are no other large pockets of resistence other than Baghdad and Basra - which are both off limits to being nuked due to civilian casualties (and rightfully so).
The daisy-cutter and new MOAB options are the only thing left THIS SIDE of nuclear.
How about a small nuke in an unpopulated area of the desert? A demonstration of our wrath, with the implicit message that the next one would hit Baghdad.
At least not ON Baghdad.
Why not? Drop 4 nukes, north, south, east and west. Then broadcast they have 24 hours till one is dropped in the center.
Game over.
We gotta sterilize the contaminated areas right?