I'm shocked, shocked that the US would have a plan for attacking Iran. Of course the US has plans for attacking practically everyone. I would imagine there is even a plan for attacking Canada.
War Plan White : domestic uprising in the US
War Plan Gray : Caribbean republic.
War Plan Purple : Central American republic, or possibly with Russia (There may have been two different Purples).
War Plan Green : Mexico
War Plan Gold : France and French Caribbean possessions.
War Plan Black : Germany. The best-known version of Black was conceived as a contingency plan during World War I in case France fell and the Germans attempted to seize French possessions in the Caribbean, or launch an attack on the eastern seaboard.
War Plan Indigo : Iceland
War Plan Brown : uprising in the Philippines.
War Plan Yellow : China
War Plan Olive : Spain.
War Plan Silver : Italy.
War Plan Emerald : intervention in Ireland in conjunction with War Plan Red.
War Plan Tan : Cuba.
War Plan Orange : Japan
War Plan Red : Britain
War Plan Crimson : Canada.
War Plan Scarlet : Australia / New Zealand
War Plan Ruby : India
War Plan Red-Orange : Japan / Britain (Anglo-Japanese military alliance expired 1924)