I'm not sure that it's the same agreement with the cruise lines, since like you said most of them are foreign flagged, but I'm willing to bet they
have some sort of agreement, to get some kind of break from the government in return for helping. If not they'll negotiate one.
As far as the Tarawa/Essex classes, I'm sure they have either one of them or a CVN they're working on getting there, but it takes time to get them
ready to sail if they aren't already worked up or working up. After the Tsunami they were lucky in that the Lincoln was already undergoing workups
for her deployment that was coming up soon anyway, so she was able to sail almost immediately.
Hey, look what I just found.
Iwo Jima and the amphibious transport dock USS Shreveport (LPD 12), as well as the dock landing ship USS Tortuga (LSD 46) and the rescue and salvage
ship USS Grapple (ARS 53) – both based at Naval Amphibious Base (NAB) Little Creek, Va., will join the Norfolk-based USS Bataan (LHD 5) that is
already off the Gulf Coast.
www.news.navy.mil...
USS Harry S Truman, USS Wibdey Island, USNS Arctic, USNS Comfort are either on the way, or preparing for deployment.
www.news.navy.mil...
www.news.navy.mil...