To mount the fire control system you are suggesting is another large engineering change that is costly and time consuming. I'm not sure it is even feasable. The Abrams is an engineering marvel, intended to kill enemy tanks on the battlefield. That it does very well. Again, the right tool for the job is needed the Abrams is not that tool in this case(my opinion).
So given the options of leaving hundreds of our old M1's mothballed in Alabama or updating them for urban combat in Iraq, you'd choose to let them collect dust and rust stateside?
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