Kammala jumla mai zuwa: Sakon Jafananci a ranar 9 ga Afrilu 1942 ya nuna cewa "RZP Campaign" a kan Port Moresby ya zama mamayewa ba harin iska ba kuma wanda zai keɓe Ostiraliya daga Amurka. USN codebreaker Rudy Fabian a FRUMEL ya sanar da MacArthur wanda ya kasance "mai rashin imani" kamar yadda yake tsammanin makasudin zai kasance New Caledonia, don haka Fabian ya bayyana tsarin (JN-25) tsarin ɓoyewa kuma ya nuna masa sakon kwamandan Jafananci tare da manufofin da za su iyakance motsin jirgi na abokan gaba da kuma kai hari ga arewacin Australia. Don haka an aika da jigilar da za ta tashi washegari zuwa New Caledonia zuwa Port Moresby. A ranar 23 ga Afrilu Fabian ya nuna wa MacArthur cewa IJN yana tara manyan sojoji a Truk, kuma yana shirin mamaye Tulagi kuma. MacArthur ya sami jirgin saman leken asiri na Australiya don "gano" sojojin mamaye Port Moresby a ranar 5 ga Mayu, wanda ya kai ga
Yaƙin Tekun Coral (duba Babban Ofishin).