The Okinawa campaign in WW2 has often been described as marking the end old style total war. Where “cork screw and blow torch” close combat to the death between American attackers who fought to live and Japanese defenders who died in order to fight played out its last dance.
Upon closer examination, as this first article in a series planned to run through August 2018 will demonstrate, the Imperial Japanese were a fell World War 2 high tech foe, punching in a weight class above the Soviet Union. In high tech warfare, as in everything else, the Samurai clan dominated Japanese military was smart, driven, capable, and deadly. Their culture was obsessive about doing everything their own way, partly copying, but always obsessive about the Japanese originality of the design. Whether we are looking at the Mitsubishi A6M “Zero” fighter, the 72,000 ton and 18-inch gun armed Yamato Class battleships or the I-8 and I-400 class submarine aircraft carriers. These innate skills as high tech warriors meant Okinawa was in many ways far better described as a high tech war for the electromagnetic spectrum between peer competitors.
Point in fact, Okinawa was a “secret radar war” where two opposing command, control, communications and intelligence (C3I) sensor networks were directing land, sea and air forces in a series of moves and counter moves. And while the less technologically advanced, and organizationally deficient, Japanese military lost Okinawa proper. It still took advantage of US Navy institutional biases, American inter service rivalries, political weaknesses, US Naval high command unwillingness to learn from “non-approved” sources and most especially its operational security failures to defeat the US Navy’s original plan to overrun the Ryukyu’s. Denying the American military the Northern Ryukyu air bases it originally sought to cover the proposed Operation Olympic landings.
The first block in that Japanese Pyrrhic electronic warfare victory at Okinawa was laid at Bombay Shoal, off Palawan in the Philippines. Where the USS Darter sank Japanese Admiral Kurita’s flagship the heavy cruiser IJNS Atago during the greatest naval victory in America’s History, the Battle of Leyte Gulf. And Japan had its biggest windfall of captured American secret radar documents in World War 2 — and second biggest secret document windfall over all — from Atago’s killer.
THE OFFICIAL USS DARTER NARRATIVE
The following passage is from Dictionary of American Naval Fighting Ships and it describes The USS Darter’s victory and grounding below —
Returning to Brisbane 8 August 1944, Darter cleared on her fourth and last war patrol. She searched the Celebes and South China Seas, returned to Darwin to fuel and make minor repairs 10 September, and put back to the Celebes Sea. She put in to Mios Woendi 27 September for additional fuel, and sailed on 1 October with Dace (SS-247) to patrol the South China Sea in coordination with the forthcoming invasion of Leyte. She attacked a tanker convoy on 12 October and on 21 October headed with Dace for Balabac Strait to watch for Japanese shipping moving to reinforce the Philippines or attack the landing forces.
In the outstanding performance of duty which was to bring both submarines the Navy Unit Commendation, Darter and Dace made contact with the Japanese Center Force approaching Palawan Passage on 23 October 1944. Immediately, Darter flashed the contact report, one of the most important of the war, since the location of this Japanese task force had been unknown for some days. The two submarines closed the task force, and initiated the Battle of Surigao Strait phase of the decisive Battle for Leyte Gulf with attacks on the cruisers. Darter sank Admiral Kurita’s flagship Atago, then seriously damaged another cruiser, Takao. With Dace, she tracked the damaged cruiser through the tortuous channels of Palawan Passage until just after midnight of 24 October when she grounded on Bombay Shoal. As efforts to get the submarine off began, a Japanese destroyer closed apparently to investigate, but sailed on. With the tide receding, all Dace’s and Darter’s efforts to get her off failed. All confidential papers and equipment were destroyed, and the entire crew taken off to Dace. When the demolition charges planted in Darter failed to destroy her, Dace fired torpedoes which exploded on the reef due to the shallow water. As Dace submerged, Darter was bombed by an enemy plane. Dace reached Fremantle safely with Darter’s men on 6 November.
In addition to the Navy Unit Commendation, Darter received four battle stars earned during her four war patrols, the last three of which were designated as “successful”. She is credited with having sunk a total of 19,429 tons of Japanese shipping.
A more recent August 16, 2016 article titled Darter & Dace at the Battle of Leyte Gulf by David Alan Johnson at Warfare History Network expands on the circumstances that caused the seasoned captain of the USS Darter, Commander McClintock, to ground her in the heat of combat. The following happened shortly after Darter and her wolf pack companion USS Dace sank two and damaged one heavy cruiser of Admiral Kurita’s “Center Force” —
They decided to make a surface attack, but expected that the cruiser would be towed by the two destroyers. To everyone’s surprise, Takao got underway under her own power. She began heading southwest at about six knots. This presented a new situation; torpedoing a moving target presented different conditions from shooting a sitting duck, even if the target was only moving at six knots. The two captains would split their attack—Darter would make her attack from the east while Dace made an end run around from the west. By midnight on October 24, the two submarines were still getting into position for their torpedo attack. Darter was making 17 knots, trying to attack before Takao could pick up more speed.
For the past 24 hours, both submarines had been navigating the Palawan Passage by dead reckoning only. Because they had spent so much time submerged during the daylight hours, navigators were not able to get a fix on the mountains on Palawan, which meant that they were not exactly certain of their position. Clouds obscured the stars after sunset, so they were not able to get a celestial fix, either.
To evade the screening destroyers, Commander McClintock planned to leave a margin of seven miles to Bombay Shoal, which is a coral reef on the western side of Palawan Passage. A quarter-knot error in estimating the current put Darter on a collision course with the reef. At 12:05 am, Darter’s crew found out exactly why that stretch of water was called the Dangerous Ground.
The one thing in common about both David Alan Johnson’s and Dictionary of American Naval Fighting Ships description of events is that they are wrong about USS Darter burning all its secret documents. It didn’t.
This is what Commander McClintock actually said in his log:
“0015 H Jap destroyer now began closing. He must have heard us hit.
Commenced burning secret and confidential matter and destroying
confidential gear. All hands not engaged in destroying gear employed
in lightening ship.”
“0230 H Tide receding now. We are high and dry. Ceased effort to get
off. Concentrated on destroying confidential gear. Three fires were
kept burning below decks to destroy classified matter: one in forward
engine room, one in radio shack, one in officer’s shower. These made
much smoke. Smoke was kept down to some extent by running #10 blow
continuously. More fires would have made destruction work below
impossible. As it was, personnel had to go topside for air every few
minutes. All registered publications except ONI-49 destroyed by
burning. Report of confidential matter not burned submitted by
dispatch and will be submitted by separate letter.
FOLLOWING GEAR DESTROYED:
1. SJ radar including magnetron tubes
2. SD radar; ABK; BN; ARC
3. Sound gear in forward room; including JP.
4. Sound gear in conning tower.
5. TDC and both gyro angle indicator regulators.
8. Ship’s radio transmitters and receivers
9. All generators were burned out (main generators)”
And if fortune favors the well prepared…Commander McClintock made clear his crew wasn’t, because the US Navy as an institution gave them inadequate tools and expected them to improvise the impossible. At pages 216-217 of the on-line logs of USS Darter, Commander McClintock made the following biting remarks:
1. Demolition Outfit: It is recommended that a permanent wiring system for the demolition charges be installed on each submarine at the earliest practiable date. Conditions such as those encountered by the Darter call for this. With lightening the ship, destruction of gear installations below decks, and fires burning, the flimsy wiring provided may easily be damaged; and the wiring available to rig the charges may easily be inadequate, if the ship is left in the presence of the enemy in circumstances where it cannot be sunk.
2. Classified Matter: It is recommended that the number of registered publications carried on board be further reduced. Also that all confidential files except essential letters be turned in prior to departure on patrol . The time taken to burn all the registered publications and confidential charts, let alone ordinary confidential letters, makes this of vital importance.
The bold in the passage above was underlined in the type written original document.
Everything that could go wrong on the USS Darter after she grounded, did so, at the worst possible time. And the boarding parties of the Imperial Japanese Navy captured USS Darter’s complete unburned library of classified documents.
Why that happened has been explained.
The “Who” of it, the Japanese naval commander who seized both fortune’s prize, and Darter’s secret documents, is next
THE MIXED LUCK OF CAPTAIN ONADA SUTEJIRO
In the disaster that was the Battle the Leyte Gulf, Japan was well served by Capt Onada Sutejiro [Etajima 48 Class].
Capt Onada, prior to his command of the IJNS Takao, was heavily involved in Japanese diplomacy. Capt Onada was sent to France 1928-29 and he visited Europe with Admiral OSUMI Mineo Mission in 1939. He again visited Germany in 1943 with Major General OKAMOTO Kiyotomi’s delegation via Siberian Railway. Capt Onada then returned to Japan aboard Japanese submarine I-29 in July 1944.
Through a matter of purest luck, he missed being sunk on the I-29 as after the former docked at Singapore. As it was decided by Japanese naval high command that he should return immediately by air. After leaving Singapore the I-29 was sunk by a submarine, likely cued on to its departure by ULTRA intercepts of the Japanese JN-25 naval code.
Shortly after arriving in Japan, Capt Onada, he was given the IJNS Takao, and the mixed luck that he had at Singapore held at Bombay Shoals
The Darter was stalking Capt Onada’s damaged Takao when she ran aground on the Bombay Shoals. According to page 638 of John Pardos’ COMBINED FLEET DECODED, — as the the senior officer on the scene and knowing the possible prize — Capt Onada had crewmen from his escorting destroyers Hiyodori and Naganami board the abandoned USS Darter looking for documents the afternoon of 25 Oct 1944, after she grounded the night of 24-25 Oct 1944.
When the salvage crews of the US Navy arrived years later to finally destroy USS Darter by detonating her torpedo stock — which is mentioned in a report appended to the logs of the USS Darter — they found not a single classified document aboard.
|Figure 3: A 1944 aerial view of Mios Woendi and the Mios Woendi PT Boat Base (Camp Taylor) near Biak in New Guinea. Two Submarine tenders based here supported USS DACE and DARTER 27 – 29 Sept. 1944 with maintenance plus the latest secret communications, charts and other confidential documents prior to their engaging the Japanese Combined fleet off Palwan in the Battle of Leyte Gulf. Photo Credit: Pacific Wrecks dot Org|
Page 53 (62)
“One of the most important discoveries of captured documents was made
by the Japanese Navy from the U.S. submarine Darter, which ran aground
west of Palawan on 23 October. The Japanese recovered many documents
dealing with radar, radio, and communications procedure, as well as
instruction books, engine blueprints, and various ordnance items.
It is difficult to evaluate the intelligence which the Japanese have
obtained from documents, but in those cases here it has been possible
the information has been found to be relatively accurate.“
Issues one through 15 would have been aboard USS Darter in October 1944. Taken together and analyzed by signals intelligence experts, they gave a complete technical background and a electronic listening fingerprint to all the major radio equipment used by the US Navy up to July 1944 including the YG Radio Homing Equipment used by US Navy strike aircraft returning to carriers. In short, Japanese signals intelligence had technical “Keys to the Kingdom” on every major piece of radio equipment in the American Navy. And this happened in time to be used for the Japanese Kamikaze Campaign no later than November 1944.
-Hold that Thought-
We will revisit it later.
A Confidential magazine published monthly by the
Chief of Naval Operations for the information of
commissioned, warrant, enlisted personal, and per·
sons authorized, whose duties are connected with
the tactical use and operation of electronic equipment.THE INFORMATION CONTAINED IN THIS
PUBLICATION IS CONFIDENTIAL And as such
will not be transmitted or revealed. in any manner,
to unauthorized persons.
This Publication is to be handled in accordance
with Article 76 U.S. Navy Regulations, and will
be destroyed by burning when it has served its
purpose. Neither quarterly reports nor reports of
burning are required.
“This and other copies of “C,I.C” shall be included with other classified material which is to receive emergency destruction in the event of possible loss or capture. Commanding Officers of units employed in landing operations or similar hazardous duty are directed to destroy or land this publication prior to operations. C.I.C.” shall not be carried for use in aircraft.”
“Window” Pg 1 — The German & Japanese use of expendable radar decoys is discussed with radar scope photos.
“Radar and Weather” Pg 5 The effects of weather on USN Radars is discussed with diagrams of SK radar fade charts provided.
“This Is Fighter Direction” Pg 11“Fighter Direction Aboard an AGC” Pg 17
“Some Shipboard CIC’s” Pg 18 – Pages 11 through 20 are a series of photo essays showing fighter direction as executed with what equipment.
“The Night Fighter” Pg 21 – “…The care and feeding of” This article is about the training and maintaining of Night fighter pilot skills.
“Harbor Underwater Detection” Pg 24 — An article on allied harbor defense sensors, nets and organization of their use.
“Combat Lessons” Pg 26 — Includes “Leatherneck GCI” by VMF(N)-531, the USMC’s premier land based night fighter unit.
“Two Kills, One Probable” pg 28 — By Air Warning Squadron One (AWS-1) USMC’s premier land based radar unit and an USN ARGUS radar training group exercise where the “enemy” airplane hid in Santa Cruz’s radar shadow,
“Are You Sabotaging The IFF System?” Combat Information Center Sept 1944 Pg 1 – 6.
IOW, in a crowded sky, a lot of US planes, together, with their beacons turned on, could hide a Japanese plane trailing them because of the overwhelming number of IFF responses from a small area of a radar screen.
This was the exact tactic Japanese Kamikazes used off Luzon and Formosa against Task Force 38 (Adm Halsey) in November 1944.
The trick of following an enemy flight home to its carrier was new at Midway in June 1942.
But it was not until Dec 1944 almost 2.5 years later, a couple of months after the loss of the USS Darter, that Rear Adm Baker and Captain Thatch (of “Thatch weave” fame) invented the “Tomcat” picket destroyer concept. A tactic where there were two radar pickets, with overhead combat air patrol (CAP), either side of a line sixty mile towards the strike group’s target, were placed such that returning planes were to orbit them and be visually inspected for enemy planes by the CAP.
The US Navy advertised these as purely anti-Kamikaze defense** adaptations…but I’d scratch out the word “purely” and substitute “mostly.”
(** Per Adm McCain, on Page 58 of Adm. Samuel Elliot Morrison’s History of United States Naval Operations in WW2, Vol. XIII The Liberation of the Philippines.)
Author John Prodos also mentions the Darter capture in “The Combined Fleet Decoded”and states the Japanese got some useful information on US radar and diesel engines, but didn’t have the time or the resources to put them to good use.
The problem I have with “The Combined Fleet Decoded” assessment is the timing of the following kamikaze attacks —
Essex (CV 9), Philippines, 25 November 1944
Intrepid (CV 11), Philippines, 25 November 1944
Hancock (CV 19), Philippines, 25 November 1944
Cabot (CVL 28), Philippines, 25 November 1944
October 25, 1944 to late Nov 1944 is enough time for the Japanese to board Darter, get any non-burned papers, have a technical intelligence officer figure out the non-directional nature of the ABK & BN “ski-pole” Type 3 IFF antenna (Photos of the grounded USS Darter in 1945 show these intact above), and use that information to fox the USN fighter direction on Task Force 38 via following returning strikes close enough to get good IFF radar returns and strike those four carriers.
Then in reaction in Dec 1944, we have the US Navy develop “Tomcat” tactic of radar picket DD, with visual CAP inspection, introduced as mentioned by both Adm Morison in 1959 and again by Clark Reynolds in his 1968, The Fast Carriers: The Forging of an Air Navy,.
The repetitive mention by USN & USMC radar operators of IFF returns from Japanese aircraft during the Okinawa campaign certainly indicated that the Navy Department thought the Japanese had compromised the Type 3 IFF.
Yet you won’t find this fact in the narratives of the Okinawa campaign.
The full “Why” that was will await future columns in this series, but the then clearly inevitable post-war founding of the Defense Department had a lot to do with it.
Sources and Notes:
Combat Information Center Magazine on-line Archive
San Francisco Maritime National Park Association
Richard Pekelney, Webmaster
Clark Reynolds, The Fast Carriers: The Forging of an Air Navy, see page 290 for TOMCAT tactics, Originally published in 1968, currently published Naval Institute Press (March 5, 2008) ISBN-13: 978-1557507013, ISBN-10: 1557507015
David Alan Johnson, “Darter & Dace at the Battle of Leyte Gulf” August 16, 2016
Mios Woendi PT Boat Base (Base 21, Camp Taylor) Papua Province Indonesia https://www.pacificwrecks.com/ships/ptboat/bases/mios_woendi/ https://www.pacificwrecks.com/ships/ptboat/bases/mios_woendi/1944/aerial-base21.html
Adm. Samuel Elliot Morrison, History of United States Naval Operations in WW2, Vol. XIII The Liberation of the Philippines, Little, Brown and Company; First Edition edition (1959)
NavSource Online: Submarine Photo Archive
Contributed by Lester Palifka
SRH-254 THE JAPANESE INTELLIGENCE SYSTEM MIS/WDGS 4 September 1945, page 53 (62 in PDF)
Electronic copy in author’s possession downloaded from the Proquest database at Nimitz Library Summer 2016
SS-227, USS DARTER Submarine War Patrol Report
Submarine aircraft carriers of Japan
USS Dace (SS-247)
USS Darter (SS-227)
Yamato-class battleships (大和型戦艦 Yamato-gata senkan)