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		| Originally posted by Spanky We could if we had to, but it would seriously tax our armed forces (and our nation) and should only be used as a last resort.
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 The population is 70 million, well more than Iraq and Afghanistan combined.  It's hard to imagine that the population would be on our side.  The terrain is generally less conducive to the kind of operations we would want to stage, and our supply lines  presumably would come through hostile (Shi'ite) territory in Iraq.  Considering how stretched our forces are now, an invasion would be a tall order.   
Of course, what's possible depends on what we try to do.  Occupying Tehran would be a nightmare.  But invading less populated parts of the country less so.