It has to be. Bringing down Iran's military crippling them is no small operation. Those people are armed to the teeth. This might be the biggest military operation since perhaps the Vietnam War?
To be effective with minimal casualties, we and Israel need to go in and hit the whole military complex so unexpectedly, so quickly, that the entire country is caught with its pants down rendered inoperative before they have any chance to retaliate, and Iran is a big country.
This is going to be a rather big embarrassment for Russia and especially China once again, along with a major concern.