I remain of the opinion that the forces being sent are not to capture islands or seize the nuclear material, the force in theater and being sent is grossly inadequate to those ends.
I heard on a military podcast that the marines are ideally suited for raids-get in do damage get out.
That might be their purpose
Or as a QRF for threatened embassies.
The Iraq situation is deteriorating, maybe they are reserves for that situation.
The thing to keep an eye out is if Piggy calls in the National Reserves. That would indicate a true land campaign.
But, again, we are at a serious operational disadvantage for any land campaign. As the Rus-Uk war shows drones completely change the battle front. Where can our troops safely assemble free of drone? Russia abuts Ukraine. We would have to set up a jumping off point for any campaign well within drone range. which will subject our forces to attack during assembly.
I honestly don't have any good concept of what the land campaign could encompass. Probably I am missing some basic options, I admittedly am not an expert on modern warfare, but the stuff being discussed, Kharge Island and seizing the nuke material seem like incredibly bad ideas.