I have a feeling us and israel are waiting for iran to dig out their nuclear material. That is if iran is even trying to dig it out. Reason being, the us tried to set up a base and obv failed. They know they cant stay for long, max stay for just enough to extract the material. Highly doubt they acheive it, but if iran is digging it out that could be a reason why they are not attacking as yet. In the mean time lets hope iran is preparing for such a massive response towards israel, that they will not be able exist once the iranians are done with them