Featured Blogger Report: Occupation – Sub Clean-up // Pacific Paratrooper #AceHistoryDesk reports

In a dry-dock at Kure Naval Base, Japan, 19 October 1945. There are at least four different types of midget submarines in this group of about eighty-four boats, though the great majority are of the standard “Koryu” type. The two boats at right in the second row appear to have an enlarged conning tower and shortened hull superstructure. The two boats at left in that row are of the earlier Type A or Type C design, as are a few others further back in the group

By definition, a midget submarine is less than 150 tons, has a crew of no more than eight, has no on-board living accommodation, and operates in conjunction with a mother ship to provide the living accommodations and other support. The Japanese Navy built at least 800 midgets in 7 classes, but only a fraction had any noticeable impact on the war. Their intended purpose initially was to be deployed in front of enemy fleets, but their actual use would be in harbor attacks and coastal defense.

The Japanese midget subs were not named but were numbered with “Ha” numbers (e.g., Ha-19). These numbers were not displayed on the exterior and operationally the midgets were referred to according to the numbers of their mother ships. Thus, when I-24 launched Ha-19, the midget was known as “I-24tou” (designated “M24” in some texts). The “Ha” numbers were not unique either; some Type D’s were numbered Ha-101 through Ha-109.

US officials overlooking captured Japanese submarines in Kure, Japan.

In mid-1944, with coastal defense requirements becoming urgent, the Japanese Navy developed the Koryu Tei Gata Type D. More than just another improved version of the Type A, this was a new design. They were the largest of Japan’s midgets, displacing about 60 tons, 86 feet (26 meters) in length, with a five-man crew, featuring a more powerful diesel engine, and had improved operating endurance. Koryu’s armament consisted of two muzzle-loaded 17.7-inch torpedoes. As with the earlier types, individual boats had alpha-numeric names in the “Ha” series beginning with Ha-101.

Click to view slideshow.

Some 115 units had been completed when Japan capitulated in August 1945. At the end of the war, Allied Occupation forces found hundreds of midget submarines built and building in Japan, including large numbers of the “Koryu” type; nearly 500 more were under construction. Some of these submarines intended for training pilots for Kaiten type manned torpedoes, had an enlarged conning tower and two periscopes.

Kaiten aboard surface vessel

Kaiten submarines were designed to be launched from the deck of a submarine or surface ship, or from coastal installations as a coastal defence weapon. The cruiser, IJN Kitakami, was equipped to launch Kaiten and took part in sea launch trials of Type 1s. In addition, several destroyers of the Matsu class were also adapted to launch the weapon.
In practice, only the Type 1 craft, using the submarine delivery method, were ever used in combat. Specially equipped submarines carried two to six Kaiten, depending on their class.

Partially from: Rare Historical Photos.com

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Military Humor –

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Farewell Salutes –

William Adams – Jena, LA; US Air Force, Vietnam, 101st Airborne Division, Col. (Ret. 22 y.)

Gordon Bashaw (100) – Gardner, MA; US Army, WWII, ETO, Bronze Star

Thomas Carney – Cleveland, OH; US Army, Vietnam, Lt. General (Ret.)

Joseph Giles – Louisville, KY; US Army, Korea, 187th RCT

Charles Hickman (101) – Leola, SD; US Army Air Corps, WWII, PTO

James Loveall – Rockville, IN; US Army Air Corps, WWII, PTO, Co. C/ 188/11th Airborne Division

Marshall Minton – Kouts, IN; US Army, WWII, ETO, Sgt., 44/157th Field Artillery

Weston Norman – TX; US Army, WWII, PTO

James Shanahan Jr. – Cedar Rapids, MI; US Navy, WWII, Pearl Harbor, KIA

Albert Zieg – Portland, OR; US Army Air Corps, WWII

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Source: // Pacific Paratrooper

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