Bill and Uconn James are correct about the different scenarios. You need to have plans for every scenario.
This plan has been around since 1973, and is regularly updated.
From what I understand, mentioning details of a plan, along with mentioning the plan number is classified. This does not add up, that the goverment would declassify this information.
As far as Uconn James' points about the DPRK using this for rhetroic, they have been using this as rhetoric since 1998, when the plan was leaked to the press.