Is an interesting thing that there are aircraft carriers but not hospital carrier ships... would make some things much easier
https://www.defense.gov/News/Article/Article/1334349/usns-co...
It'd be interesting to see a real analysis of the difficulties. Among the first things that come to mind is efficient use of personnel. There is need for medical care there, so there is a decision between having medical people available locally and having them transporting patients.