EDIT: Made a major mistake in my numbers. Reworked the calculations but the substantive part of the argument remains the same.
A San Antonio has ~20,000 square feet of deck space usable for vehicles and cargo. If you stuffed it with TEUs you could fit 125.[0][1] Maximum mass capacity for a TEU is ~21t, let's call it 20t for easy math.[2] So a San Antonio moving containerized beans/bullets/bandaids is only lifting ~2,500 tons per sortie. There are only 12 active San Anontios, and keep in mind roughly 1/3 of any fleet is down for maintenance), so you would need half of all likely available LPDs (4 of 8 available with 4 in yardwork) of the largest (by tonnage, not hull numbers) Navy on the planet.
As for helicopters, you can carry palletized cargo internally on a CH-53 (one of it's few advantages over a CH-47). The K model, with stronger engines (and therefore payload capacity) than the E model, can move ~12t at 200km.[3] Let's just call it 10t at 200km, again for easy math. You would need 1,000 sorties in a day to move 10kt. If you pushed your aircraft to 3 sorties per day (limited by ground crew ability to turn the aircraft), you could do it with ~333 heavy lift helicopters. The US only has ~20 operational CH-53Ks, and ~140 CH-53Es. So no, moving 10kt per day is not a joke, and can't be shuffled by helicopters alone.
It would take both asset classes combined, let's call it 3xLPD for 7.5kt and ~80 CH-53s flying 240 sorties for 2.4kt. That would pretty much be a maximum effort for the Navy-Marine Corps Team, which is inarguably the largest and most capable military power projection and expeditionary logistics force on Earth.
So even in 2024, what they accomplished on D-Day is not a trivial amount of effort.
A San Antonio has ~20,000 square feet of deck space usable for vehicles and cargo. If you stuffed it with TEUs you could fit 125.[0][1] Maximum mass capacity for a TEU is ~21t, let's call it 20t for easy math.[2] So a San Antonio moving containerized beans/bullets/bandaids is only lifting ~2,500 tons per sortie. There are only 12 active San Anontios, and keep in mind roughly 1/3 of any fleet is down for maintenance), so you would need half of all likely available LPDs (4 of 8 available with 4 in yardwork) of the largest (by tonnage, not hull numbers) Navy on the planet.
As for helicopters, you can carry palletized cargo internally on a CH-53 (one of it's few advantages over a CH-47). The K model, with stronger engines (and therefore payload capacity) than the E model, can move ~12t at 200km.[3] Let's just call it 10t at 200km, again for easy math. You would need 1,000 sorties in a day to move 10kt. If you pushed your aircraft to 3 sorties per day (limited by ground crew ability to turn the aircraft), you could do it with ~333 heavy lift helicopters. The US only has ~20 operational CH-53Ks, and ~140 CH-53Es. So no, moving 10kt per day is not a joke, and can't be shuffled by helicopters alone.
It would take both asset classes combined, let's call it 3xLPD for 7.5kt and ~80 CH-53s flying 240 sorties for 2.4kt. That would pretty much be a maximum effort for the Navy-Marine Corps Team, which is inarguably the largest and most capable military power projection and expeditionary logistics force on Earth.
So even in 2024, what they accomplished on D-Day is not a trivial amount of effort.
[0] https://www.navsea.navy.mil/Home/Team-Ships/PEO-Ships/LPD-17...
[1] 20000 / (20ft long x 8ft wide TEU) ~= 125 TEUs worth of deck space, assuming you use ALL deckspace but can't/don't stack them 2 high
[2] https://en.wikipedia.org/wiki/Twenty-foot_equivalent_unit
[3] https://www.navair.navy.mil/product/CH-53K-King-Stallion