Did the Japanese know or soon realize that the interception and downing of Yamamoto's plane was carefully planned and not a random occurrence? I'm watching "Letters From Iwo Jima" and General Kuribayashi just told Admiral Ohsugi that he wasn't allowed to radio his arrival time "because of what happened to Admiral Yamamoto." I thought the Americans took great pains to make it appear a random raid. One of my favorite movies, by the way. Highly recommended. Much much better than "Flags of our Fathers"
I’m not sure if this report answer’s your question Operation Vengeance : Assassination of Admiral Yamamoto : 18 April 1943 The Japanese did not announce Yamamoto’s death until 21 May, although U.S. Navy communications-traffic analysts and cryptanalysts were able to determine by changes in Japanese communications that he had been killed almost immediately. Or possibly this info The Japanese public wasn’t told about his death until May 21, 1943. The U.S. released a cover story to hide that the Americans were reading Japanese code, that civilian coastwatchers in the Solomons observed Yamamoto boarding a bomber and relayed the information by radio to American naval forces in the immediate area.The Japanese never thought their codes had been broken. Operation Vengeance, April 18, 1943, Admiral Yamamoto is Assassinated
