A floating pier and causeway that will be used to deliver critical humanitarian aid by sea to Gaza is expected to take at least one month or possibly as long as two for the US military to build and become fully operational, Pentagon Press Secretary Major General Patrick Ryder said on Friday.
That's still pretty quick if it's capable of supporting large trucks and long enough to allow cargo ships to dock next to it. It's probably a week or so to get the materials to construct it on site.
Well for one Israel won't let Americans put boots on the ground so that's makes it very difficult already.
But even if they could, their best option would be to get an amphibious assault ship in the area and use that to transfer small trucks but that would probably tske just as long or longer to tranfer to the area and even working as fast as possible 24/7 they would really struggle to get a decent amount of aid into gaza and would probably be less than they could airdrop.