Started this question awhile back about using islands as last stand for Carriers whose orphaned aircraft can launch one more wave after a carrier is sunk. After a lot of friendly deliberation, it was felt using islands as an asset would work better in Operations. I can't take credit for Operations, @pewpewpew42 offered that one.
However to extend the idea, Operations ONLY, maybe have a scenario where you have folks in boats, as well as land batteries or other types of land based assets in a "fend off an overwhelming swarm" type of thing, against a fixed asset like a base? Just ruminating out loud.