I was curious about this floating pier business so I looked up what I could find out. There is a whole world out there of international shipping blogs, twitter, and YouTube and the world of those people (international shipping logistics types) have been chatting about it. From what I have been able to discern
1. There is a US Army vessel (not Navy) called the USS Besson that departed Virginia in route for Gaza on Saturday March 9th. It is part of the Army’s Seventh Transportation Brigade (Expeditionary), and that some 1,000 American service members will be involved (I did not know that the Army had its own ships, learn something new every day). No exact word when all will be up and running but minimum several weeks.
2. These vessels are designed to assemble temporary floating pier structures at sea then they push the assembled pier (or large sections of it) ashore with smaller tugboat style vessels and anchor it to the shore and sea floor with lots of heavy anchors. Here are some pics of them doing the same thing during military exercises in Korea a couple years ago. So this is something they regularly practice
3. Apparently the Army would be using all of its equipment to offload aid ships docked at this floating harbor with heavy equipment and delivering it to nearby staging areas for transfer onto aid trucks with army cranes and fork lifts or whatever they use. As you can see from the first photo, the Army has big fork lifts that can lift and carry whole shipping containers and probably cranes that can pull stuff off of cargo ships. They have been doing this sort of thing for a long time. Since at least WW2.
4. Finally the Israeli Army will be on site inspecting goods as ships offload them before they are handed off to aid organizations in the harbor for distribution to the rest of Gaza. Which makes me wonder what the whole point of this is other than optics since they could be doing that same thing at the Egyptian border without going through all this trouble.