Parker 2017, pp. 18–21; Willmott 2002, pp. 21–22; Parshall & Tully 2005, p. 60. For unknown reasons, the IJN postponed making their scheduled change of the Ro code from 1 April to 1 to 27 May 1942 (Willmott 2002, pp. 21–22; Lundstrom 2006, p. 119). The U.S. operated Fleet Radio Units in Washington, D.C., Pearl Harbor and, with the Australians, at Melbourne (Prados 1995, pp. 300–303). Parker, Frederick D. (2017) [First published 1993]. "Part One: The Battle of the Coral Sea". A Priceless Advantage: U.S. Navy Communications Intelligence and the Battles of Coral Sea, Midway, and the Aleutians(PDF) (Monograph). Series IV: World War II. Vol. 5 (3rd ed.). Fort George G. Meade, Maryland: Center for Cryptologic History, National Security Agency. OCLC1124074152. Archived(PDF) from the original on 21 October 2020. Retrieved 14 November 2020. Willmott, H. P. (2002). The War with Japan: The Period of Balance, May 1942 – October 1943. Wilmington, Delaware: Scholarly Resources Inc. ISBN0-8420-5032-9. Parshall, Jonathan; Tully, Anthony (2005). Shattered Sword: The Untold Story of the Battle of Midway. Dulles, Virginia: Potomac Books. ISBN1-57488-923-0. Lundstrom, John B. (2006). Black Shoe Carrier Admiral: Frank Jack Fletcher at Coral Sea, Midway, and Guadalcanal. Annapolis, Maryland: Naval Institute Press. ISBN1-59114-475-2. Prados, John (1995). Combined Fleet Decoded: The Secret History of American Intelligence and the Japanese Navy in World War II. New York: Random House. ISBN0-679-43701-0.
Mayo, Lida (1991). The Ordnance Department: On Beachhead And Battlefront. United States Army in World War II – The Technical Services. Washington, DC: Center Of Military History, United States Army. p. 40. LCCN67-60000.
Matloif, Maurice; Snell, Edwin M. (1991). Strategic Planning For Coalition Warfare 1941–1942. United States Army in World War II – The War Department. Washington, DC: Center Of Military History, United States Army. p. 132. LCCN53-61477.
Parker 2017, pp. 18–21; Willmott 2002, pp. 21–22; Parshall & Tully 2005, p. 60. For unknown reasons, the IJN postponed making their scheduled change of the Ro code from 1 April to 1 to 27 May 1942 (Willmott 2002, pp. 21–22; Lundstrom 2006, p. 119). The U.S. operated Fleet Radio Units in Washington, D.C., Pearl Harbor and, with the Australians, at Melbourne (Prados 1995, pp. 300–303). Parker, Frederick D. (2017) [First published 1993]. "Part One: The Battle of the Coral Sea". A Priceless Advantage: U.S. Navy Communications Intelligence and the Battles of Coral Sea, Midway, and the Aleutians(PDF) (Monograph). Series IV: World War II. Vol. 5 (3rd ed.). Fort George G. Meade, Maryland: Center for Cryptologic History, National Security Agency. OCLC1124074152. Archived(PDF) from the original on 21 October 2020. Retrieved 14 November 2020. Willmott, H. P. (2002). The War with Japan: The Period of Balance, May 1942 – October 1943. Wilmington, Delaware: Scholarly Resources Inc. ISBN0-8420-5032-9. Parshall, Jonathan; Tully, Anthony (2005). Shattered Sword: The Untold Story of the Battle of Midway. Dulles, Virginia: Potomac Books. ISBN1-57488-923-0. Lundstrom, John B. (2006). Black Shoe Carrier Admiral: Frank Jack Fletcher at Coral Sea, Midway, and Guadalcanal. Annapolis, Maryland: Naval Institute Press. ISBN1-59114-475-2. Prados, John (1995). Combined Fleet Decoded: The Secret History of American Intelligence and the Japanese Navy in World War II. New York: Random House. ISBN0-679-43701-0.
Parker 2017, pp. 18–21; Willmott 2002, pp. 21–22; Parshall & Tully 2005, p. 60. For unknown reasons, the IJN postponed making their scheduled change of the Ro code from 1 April to 1 to 27 May 1942 (Willmott 2002, pp. 21–22; Lundstrom 2006, p. 119). The U.S. operated Fleet Radio Units in Washington, D.C., Pearl Harbor and, with the Australians, at Melbourne (Prados 1995, pp. 300–303). Parker, Frederick D. (2017) [First published 1993]. "Part One: The Battle of the Coral Sea". A Priceless Advantage: U.S. Navy Communications Intelligence and the Battles of Coral Sea, Midway, and the Aleutians(PDF) (Monograph). Series IV: World War II. Vol. 5 (3rd ed.). Fort George G. Meade, Maryland: Center for Cryptologic History, National Security Agency. OCLC1124074152. Archived(PDF) from the original on 21 October 2020. Retrieved 14 November 2020. Willmott, H. P. (2002). The War with Japan: The Period of Balance, May 1942 – October 1943. Wilmington, Delaware: Scholarly Resources Inc. ISBN0-8420-5032-9. Parshall, Jonathan; Tully, Anthony (2005). Shattered Sword: The Untold Story of the Battle of Midway. Dulles, Virginia: Potomac Books. ISBN1-57488-923-0. Lundstrom, John B. (2006). Black Shoe Carrier Admiral: Frank Jack Fletcher at Coral Sea, Midway, and Guadalcanal. Annapolis, Maryland: Naval Institute Press. ISBN1-59114-475-2. Prados, John (1995). Combined Fleet Decoded: The Secret History of American Intelligence and the Japanese Navy in World War II. New York: Random House. ISBN0-679-43701-0.
Parker 2017, pp. 18–21; Willmott 2002, pp. 21–22; Parshall & Tully 2005, p. 60. For unknown reasons, the IJN postponed making their scheduled change of the Ro code from 1 April to 1 to 27 May 1942 (Willmott 2002, pp. 21–22; Lundstrom 2006, p. 119). The U.S. operated Fleet Radio Units in Washington, D.C., Pearl Harbor and, with the Australians, at Melbourne (Prados 1995, pp. 300–303). Parker, Frederick D. (2017) [First published 1993]. "Part One: The Battle of the Coral Sea". A Priceless Advantage: U.S. Navy Communications Intelligence and the Battles of Coral Sea, Midway, and the Aleutians(PDF) (Monograph). Series IV: World War II. Vol. 5 (3rd ed.). Fort George G. Meade, Maryland: Center for Cryptologic History, National Security Agency. OCLC1124074152. Archived(PDF) from the original on 21 October 2020. Retrieved 14 November 2020. Willmott, H. P. (2002). The War with Japan: The Period of Balance, May 1942 – October 1943. Wilmington, Delaware: Scholarly Resources Inc. ISBN0-8420-5032-9. Parshall, Jonathan; Tully, Anthony (2005). Shattered Sword: The Untold Story of the Battle of Midway. Dulles, Virginia: Potomac Books. ISBN1-57488-923-0. Lundstrom, John B. (2006). Black Shoe Carrier Admiral: Frank Jack Fletcher at Coral Sea, Midway, and Guadalcanal. Annapolis, Maryland: Naval Institute Press. ISBN1-59114-475-2. Prados, John (1995). Combined Fleet Decoded: The Secret History of American Intelligence and the Japanese Navy in World War II. New York: Random House. ISBN0-679-43701-0.
