Sub question…(edit: wrong place to ask - sorry)

[Der Kuenstler]

In a current game, the USA has a lone sub sitting in the seazone by Japan. Japan places a new destroyer in the same zone as the USA sub during its turn. Does the USA have to move its sub during its combat phase or can the sub just sit there with the DD and do nothing?

[Witt]

Hi Der Kuenstler.
The US must attack the DD or else move out of the SZ in the Combat Move Phase.

[Der Kuenstler]

K thanks!