I have attached the results of scouting to the south and west. This stack (2 carriers, 4 cruisers, 1 destroyer and 9 transports) are the only attack force that can land.
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it looks like there isn't anything attack SCI, so, unless they have another stack someone I can't see, they will probably ship chain 54 units (9*6).
they can directly attack The Nursery with 8 bombers and what I think are 12 marines, some cruiser/destroyer bombardment. We can put enough in the Nursery so that they cannot possibly take it.
Alternately, they can land on the sugar next to the nursery or either of the grassland tiles between The New Yard and The Pier.
My first question concerns our EWS. Were we able to do a full recon of our perimeter (including the area around SCI)? You seemed to hedge a bit on SCI.
Assuming there are no other transports in range it would
seem the most SABER could bring to bear next turn are 12 marines and 8 bombers. Assuming they all attack and win (not likely but a worst case scenario) we would need 21 units on a tile to prevent a landing. With four potential landing tiles we'd need 84 units. We have 101 (counting marines, tanks, armor and mech infantry) but 25 of the mech inf is on islands. That leaves us 76 units which is 8 short, though this can be easily made up through drafting.
Can they bring more?
Well, we must remember that The Nursery is within bombing range of the rubber tile SE of Cattaraugus. Do we have any recon of that area regarding the presence of an airfield there? If they have one The Nursery could be facing another 10 bombers.
I'm not quite sure how ship chaining works but it seems to me SABER could build a few transports on their next turn that are in range of that stack of 9. New Saber Babes, Dirk and Estoc are port cities six tiles away from the transport stack. Does that mean any units loaded onto transports there could not attack on that turn since they would have to use their movement allowance to transfer to other transports? Kukri is only 5 spaces from the stack so a new transport there could carry more units that could attack. Since SABER can also build more marines we could be looking at 9 transports full of marines.
So The Nursery could potentially be hit by 18 bombers and
at least 12 marines. We can see 17 SABER cities on their mainland (besides Kiruk). If each makes a marine that would be 39. They may or may not have 15 more cities to build marines.

I doubt they would bring 54 marines any way. The value of taking a city lies in what can be done the same turn and that requires some fast moving units.
Still, in order to
ensure we don't lose The Nursery next turn we'd need a 73 unit garrison. (They could possibly bring 18 bombers and 54 marines to attack.) We have 76 units, can draft 22 and airlift one back from SCI giving us 99 units to work with. That leaves only 26 units left to cover the other three tiles where SABER can land.
Some recon on that tile near Cattaraugus would be valuable. No airfield there now means The Nursery wouldn't have to work about being bombed from that point. We should keep in mind also that SABER has another carrier somewhere that could possible add 4 bombers to the attack even without a Cattaraugus airfield. Can we tell where their bombers are based on the ships they bombed?
It just doesn't seem we can categorically prevent a landing. We can prevent them from taking The Nursery but can't do that and stop them from landing on one of the other three tiles.
Do we play the odds and try to garrison The Nursery with what we think is enough and do the same on the other landing spots
OR
Do we stuff The Nursery with as many as 73 units to ensure its safety while leaving the three landing spots at risk?
If we choose the latter strategy, how to we handle the three landing spots? Do we leave them entirely open OR defend them as best we can? They may be bringing armies to land.
I've concentrated solely on worst case scenarios here, mainly because I am ignorant of combat odds for these units. We do have our SAM battery in The Nursery and one mobile SAM that can garrison The Nursery. The Nursery doesn't have a barracks so we can't move the tanks there
and upgrade them this turn.
The number crunchers will have to take it from here.