An article in the Atlantic raises the possibility of a sudden requirement to evacuate American citizens (by one count 140,000) and other non-combatants, in case the Korean war suddenly turns hot. The authors go so far as to suggest China might have a role.
At the moment this seems unlikely, but things could change fast
Certainly, if it happens, whatever is available will be inadequate and the Coast Guard might have a role to play, both in providing assets (both ships and aircraft) and exploiting its liaison with counterpart organizations in Asia (even the Russians might help).
Something that might be worth thinking about.