DQ, you don't think Obama (or any US President) would if necessary?
i think that he would use stand off and air force/navy fighters/bombers, but not boots on the ground, with the possible exception of special forces to go in and blow up chemical/biological storage depots in syria, but not army/marine soldiers
in iran, obama would use bunker buster bombs with fighters/bombers and antiaircraft suppression aircraft, drones and cruise missiles
i spent over 25 years working in aerospace with military personnel and at military facilities (army, navy (air, surface and subsurface), air force and marines and have a good idea what we have available and their capabilities
we just do not have the resources to mount an actual invasion of iran or syria and certainly not both of them, but we can do severe damage to them with our other resources
also, if we attack iran, i would expect a joint operation with israel - we would need to suppress iran's antiaircraft capability to get bombers into iran and back again after they dropped their bunker buster bombs..and we may have to attack twice...one bomb may not be enough, but a second one on top of the first would penetrate...assuming we do not use nuclear weapons...
oh well