War Plan Orange
Cain's code word "Case Orange" for Fisk to kill Adama refers to War Plan Orange, a contingency plan developed by the American military before the Second World War in case of a Japanese attack. Cain's specific directive to "terminate Adama's command, starting with Adama" is an homage to a line delivered by Harrison Ford's character in "Apocalypse Now" referring to Kurtz. Adama's code word "Downfall" for Starbuck to kill Cain refers to the German film of that name or possibly Operation Downfall, the planned Allied invasion of Japan at the end of the Second World War.