There aren’t any functional docs on the strip, the closes is a small marina for small bosts that has no equipment for receiving bulk supplies.

So you would have to load supplies onto lifeboats or ribs, ferry them across and unload them by hand, you wouldn’t even get half a tonne per trip realistically and you spend hours loading and unloading it all.

Or if they happen to have amphibious assault ships in the area, they could move small truck of supplies on to the beach. But this would be a costly and still quite innifecient process. Which is why in any actual amphibious landing as soon as the immediate area is secured the Naval Cargo Handling Batallion builds at least a temporary dock at the landing site as soon as possible.