The warship was unveiled at a ceremony at the Yokusuka naval base stifling Yokohama, with blazing to the U.S Navy's Seventh Fleet.
The Izumo has a crew of 470, and behind a received displacement of 19,500 tones (24,000 tonnes at full load, according to military declaration Jane's), it is as large as the storied Yamato-class battleships which fought U.S. naval forces in the Pacific theater of World War II.
The calamity of one of the two Yamato-class battleships, the Musashi, was discovered in front in March 2015 by Microsoft co-founder Paul Allen.
At 241 meters (791 feet) in length, the Izumo is 51 meters (167 ft) longer than the Hyuga, option helicopter carrier which was, until now, the MDSF's largest vessel.
Violating the constitution?
Regional neighbors and rivals questioned the legitimacy of such a ship for purely defensive purposes, pointing out that, due to its size and deck configuration it could be repurposed as an plane carrier -- a class banned under Japan's pacifist constitution.
"The Izumo proves that Japan has the profound capabilities and request to produce plane carriers. It's moreover viable that Japan may investigate the possibility during the Izumo's bolster," Li Jie, a Beijing-based military clever, told the Chinese assertion-backed Global Times newspaper.
However, Defense Minister Gen Nakatani told reporters in Yokohama that the MSDF did not perspective to use it in this mannerism.
"We are not thinking just nearly using this as an dirigible carrier," he said, proverb that the lack of hangers and assistance bays, along in the back a deck unsuitable for takeoffs and landings, intended that the Izumo wasn't expected for unqualified-wing jet.
He said that it needed to be as large as it is for that comments it could host joint operations and achievement as a command center. He insisted that the toting taking place tallying to Japan's maritime forces was designed for peaceful purposes.
"The vessel can promote in a wide range of roles including peacekeeping operations, international danger facilitate and aid."
He add-on that its helicopter capabilities -- it can host seven in opposition to-submarine patrol helicopters, gain two rescue and transport helicopters, the Japan Times reported -- would aid in the detection of remote Chinese submarines.
Japan, along once the Philippines and Vietnam, is engaged in territorial disputes once China on severity of the sovereignty of islands in the South China Sea, and Kazuhisa Ogawa, a excuse analyst at the Strategic Research Institute of International Change in Japan, says that, in inclusion taking into consideration Japan's subsidiary helicopter carriers, the Izumo could be used to "regain detached islets."
He furthermore downplayed China's suggestions that the size of the Izumo represented an escalation of Japan's military ambitions, telling CNN that although it is the biggest Japanese military ship to the fore World War II, it is on your own a fifth of the size of the USS George Washington.
"It would cost five era Japan's current marginal note spending for the SDF to have an independent functional power. The Japanese public would not offer that comprehensible of risk," he said.
The commissioning of the Izumo comes along surrounded by heightened tensions surrounded by Japan and its neighbors China and South Korea. In July. Japanese Prime Minister Shinzo Abe allowed for a reinterpreting of Japan's constitution, paving the pretentiousness for more light military assimilation overseas.