A U.S.-led military operation to topple Syrian President Bashir al-Assad's regime could cost up to $300 billion a year and require 300,000 troops.
That's the estimate of the Brookings Institution, which issued a report Monday as Syrian opposition groups continue to plead for Western and regional help as Assad's forces pound rebel fighters and civilians mercilessly. The Obama administration has, for now, ruled out using American military power to oust Assad.
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Update: Think tank: US intervention in Syria could require 300K troops, cost $300 billion -- The Hill
My Comment: Fortunately .... invading Syria has zero support in Washington .... and even less in the American public.