Egypt would serve as the regional control and logistics hub where material and troops can be accumulated in relative safety. Only after after Iranian offensive capabilities have been sufficiently degraded by a large scale air campaign would they be able to move troops and logsitics into Iraq and then gather there under greatly diminished Iranian fire. Iraq is a non-factor, this isn't Saddams Iraq and it's firmly in the hands of the US and Israel, especially the government, police forces and regular militaries. As for CSGs, you have Ford, Lincoln, Bush and Washington currently avilaible, of which as far as I am aware only two are currently in theater. Tripoli, Iwo Jima and Boxer could also be moved. Not to mention that deployments can be extended and maintenance cycles can be limited at the expense of deployment duration. Also JFK will be introduced into service in pretty much exactly a year from now.