Subsequently, he flew Zeros from the aircraft carrier Zuikaku from December 1941 to May 1942, including at the Battle of the Coral Sea.

Following the evacuation of the Philippines, Iwamoto served in home defense and trained kamikaze pilots.

As a result of the Japanese use of the British naval practices, the IJNAS scoring system was based on the system the Royal Navy and the Royal Air Force (RAF) adopted from World War I until World War II.

Depending on various totals cited, Tetsuzō Iwamoto or Hiroyoshi Nishizawa was Japan's top ace.

He fought over the Indian and the Pacific Ocean from north to south, and trained young pilots even in the last months of the war.

He was born on a border town, southern part of Karafuto 15 June 1916, later grew up in Sapporo, Hokkaidō, Japan.

Following the advice from his parents to study while young, Tetsuzo left for a large city where he was supposed to take a college entrance examination.

His parents were very disappointed, for they became reliant upon Tetsuzo rather than his eldest brother, who was already studying at some university in a large city and would not return to Masuda.

[7] In 1936, when he was a naval mechanic 2nd class and a crewman on the light aircraft carrier Ryūjō, he studied hard and passed the difficult IJNAS exam, taken by thousands of applicants.

He was enrolled in the class 34th Sōju-Renshūsei (Sōren means flight trainee program) for naval petty officers and sailors.

He graduated as one of the select 26 young aviators of the class 34th Sōju-Renshūsei (flight trainee program) in December of that year.

During flight training school at the Tomobe branch of Kasumigaura-Ku (Kasumigaura FR(AG)), his fighter course instructor was the well-known Chitoshi Isozaki.

Tetsuzo Iwamoto (called Tetsu in short from his senior pilots) had to wait for his debut until February 10, 1938.

Tetsuzo's ability as a fighter pilot was recognized by all on his first air mission with the 13th Flying Group on February 25, 1938, over Nanchang, China.

He kept his altitude of 4,000 m. He got an I-16 at the top of its roll in his gunsight and fired a burst, its engine burning and out of control; Tetsuzo lost sight of it before it crashed, and he reported this as probable.

Rushing to escape at full throttle with a number of enemy fighters behind him, he succeeded in returning safely from the battlefield.

Iwamoto was awarded the citation of flying group Cmdr Tsukahara for his extreme courage and conspicuous gallantry in action above and beyond the call of duty as a fighter pilot against intense Chinese air force on April 29, 1938.

In September 1938, 22-year-old Iwamoto was ordered back to Japan, where he became a member of the Saiki Air Group and appointed to a training staff.

Single to single dogfight tactic – from losing to winning [10] Formation tactics – No.3 Aerial Bomb attack tactic[14] – (World War II, 8 December 1941 – July 1942, April 1943 – 15 August 1945, Allied U.S. Army, Navy, Marine, Royal Navy, Australia, New Zealand)[15] from the corresponding article in the Japanese Wikipedia from the corresponding article in the Japanese Wikipedia The Allied Occupation Forces searched for war criminals in the Japanese Officer Corps.

Managers of nongovernmental businesses and local factories in his hometown also did not dare to employ him, in order to comply with the wishes of the new Allied GHQ.

[citation needed] In 1952, Iwamoto finally obtained employment at the Masuda spinning mill of Daiwa Bōseki (since renamed to "Daiwabō" Co., Ltd, 大和紡績).