Why Pentagon has doubts about no-fly zone over Syria.
In Libya having a "no fly zone" was not enough to let the rebels win. It took active and very destructive involvement of NATO in bombing government positions. As for Syria: Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey has noted that only 10 percent of casualties sustained by Syrian opposition forces are being imposed by air power. The other 90 percent come from direct fire or artillery.