Mezue ahịrịokwu na-esonụ: PURPLE bụ ihe na-adọrọ adọrọ, ma ọ bụ nke a na-ejighị n'aka, na-eme atụmatụ na atụmatụ ndị Japan n'ihi ọdịdị pụrụ iche nke usoro iwu Japan tupu Agha (lee n'elu). Ná mmalite, ụzọ ka mma e si eme ihe bụ Usoro Ụgbọ Mmiri nke Japan (nke e ji mkpụrụ akwụkwọ nzuzo dee), nke ndị na-enyocha ihe nzuzo nke Ụgbọ Mmiri United States kpọrọ JN-25. Ịbanye n'ụdị e ji mee ihe n'ọnwa ndị sochirinụ December 7, 1941 nyere ihe ọmụma zuru ezu iji mee ka usuu ndị agha mmiri nke United States nwee mmeri n'agha nke
Oké Osimiri Coral na Midway, na-akwụsị mbido ndị Japan na-aga n'ihu n'ebe ndịda ma na-ewepụ ihe ka ukwuu n'ike ụgbọ mmiri ndị Japan. Ka oge na-aga, okporo ụzọ JN-25 mebiri emebi nyekwara usoro iheomume na ụzọ ụgbọ elu Admiral Isoroku Yamamoto ga-eji na-efe efe n'oge njem nyocha na ndịda ọdịda anyanwụ Pacific, na-enye ndị na-anya ụgbọ elu USAAF ohere ịdakwasị onye isi nke chepụtara mwakpo Pearl Harbor. Ka oge na-aga, inweta ozi ndị agha Japan site na decryption nke okporo ụzọ nkwukọrịta ndị agha nyere aka n'ịhazi mkpọsa nke agwaetiti ahụ na Philippines na gafere.