I think the number of American soldiers who would fire on Americans would depend on how the situation is sold to them.
In the beginning it would be relatively easy to paint the enemy Americans as terrorists, you've already gone partially down that road since 9/11. Perhaps by staging another even bigger terrorist attack (ala Operation Northwoods) which is pinned on a specific group of Americans, it would serve to muster some force against them.
As the operation continues on, it becomes a bit harder, but if you exploit the 'Them or us' attitude which is popular then you could probably create enough propaganda to motivate not just the ordinary American military, but people who are loyal towards the government who might want to be formed into their own militias.
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