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Japan’s largest warship since World War II has left for its first set of sea trials last week ahead of entering the Japanese Maritime Self Defense Force (JMSDF)fleet next year.

JS Izumo (DDH-183) departed Tokyo Bay on Sept. 23, as seen as in a video on YouTube, for the first round of what will be about six months of sea trials ahead of the ship’s commissioning next year, a JMSDF official told Jane’s Defence Weekly on Monday.

The 24,000-ton helicopter carrier is the first of two planned ships. Izumo will enter the JMSDF force next year. DDH-184 will enter the fleet in 2017, according to the Naval Institute’s Combat Fleet’s of the World.

The development pair of ships have fomented regional controversy since the formal start of the program, in part because of their strong resemblance to aircraft carriers

“It is an aircraft carrier, and Japan just called it a helicopter destroyer to downplay its aggressive nature,” Zhang Junshe with the People’s Liberation Army Naval Military Studies Research Institute told China Daily last year.

To Japan’s neighbors, even the name Izumo is a loaded word.

“The original Izumo, an armored cruiser that participated in the Battle of Tsushima, was purchased with reparations from the first Sino-Japanese War,” wrote USNI News contributor Kyle Mizokami last year.

“There is little doubt all parties, particularly the Chinese, are aware of the lineage.”

Though billed by Japan as primarily an anti-submarine warfare (ASW) and humanitarian and disaster relief (HADR) platform, its character is more in line with the U.S. Navy’s America-class of amphibious warships.

Izumo is large enough to field 14 helicopters and has the capacity to carry 400 troops. Japan could also field V-22 Osprey tilt-rotor aircraft from the ship. Ospreys are used by U.S. Marines to deploy troops from the sea and were successfully test onboard Japan’s Hyuga-class DDHs in 2013.

It’s conceivable the helicopter carrier could also accommodate the short takeoff/ vertical landing (STOVL) variants of the F-35 Lighting II Joint Strike Fighter (JSF) but Japan has said publically it has no intentions of fielding JSFs from the ships.

But — like the aviation centric America — the ship is not equipped with a well deck to deploy troops via landing craft.

Following World War II, the Imperial Japanese Navy was largely sunk and its pacifist constitution only allowed for military force in a direct threat to the country.

However in the last year, Japan’s Prime Minister Shinzo Abe has led a push to expand the scope of Japan’s military cooperation and its ability to develop its military export industry.

Japan's new Izumo-class helicopter carrier currently undergoing sea trials is expected to be commissioned in 2015. The new carrier will dramatically increase Japan's force projection in the Pacific Ocean and the Sea of Japan, raising concern in China.

The new Izumo-class helicopter carrier is undergoing extensive sea trials since late September, in preparation of the acceptance of the new carrier by Japan’s Self Defense Forces Navy.

JDS Izumo helicopter carrier is the first of two 30,000 ton (full load) Izumo-class ‘helicopter carrier destroyer’ (DDH) class vessels to be commissioned next year. Unveiled last month at the Yokohama port, south of Tokyo, JS-183 Izumo, is the biggest warship in Japan’s fleet since World War II, has been described by the Chinese media as an “aircraft-carrier in disguise”. Although the is configured with a large flight deck and hangars, designed to accommodate up to 28 helicopters, Izumo does not have catapults or arresting cables nor a ‘ski jump’ curved deck, assisting short take off of conventional aircraft. The Japanese Navy is highlighting the vessels’ ability to quickly respond to emergency or natural disasters.

The construction of the first ship of the class began in 2011 at an IHI Marine United shipyard in Yokohama, at a cost of $1.5 billion (113.9 billion yen). Commissioning of the first of class is currently scheduled for 2015 with the second ship of the class, yet unnamed, to follow in 2017.

Once commissioned, these Izumo-class vessels will more than double the current anti-submarine, anti-ship, and amphibious assault capabilities of the Chinese Navy, over the current force consisting of two helicopter carriers, operating the Shirane-class helicopter carrying destroyers, accommodating 9-10 helicopters. Those vessels are planned for decommissioning soon.

The Japanese navy also operates two 20,000 ton Hyūga-class helicopter destroyers – Hyūga and Ise, commissioned in 2009 and 2011. Each is configured to carry up to 18 helicopters. These vessels typically operate three SH-60K and one MCH-101 mine sweeping helicopters. Hyūga class carriers are also equipped with Mk 41 VLS common launcher, armed with ESSM anti-air and ASROC anti-submarine weapons. Izumo class has more sensors and electronic warfare assets, designed for anti-submarine warfare and border-area surveillance missions, its self-defense capabilities are limited to close-in weapon systems (CIWS) such as the PHALANX and SEARAM.

In addition to the larger capacity, the flight of JDS Izumo deck has 5 helicopter landing spots enabling simultaneous landings or take-offs. On deployments JS Izumo will carry a typical complement of 14 helicopters, seven ASW helicopters and two SAR helicopters. In addition, the ship will be able to transport 400 marines, 50 trucks and supplies.

Some analysts have speculated the Izumo could be adapted to carry F-35B (STOVL) and V-22 Osprey tilt-rotor aircraft, but sofar official Japanese authorities have not addressed these speculations. A similar platform designed to operate those aircraft is twice as large as the Izumo – American LHA-6 – USS America – has recently been commissioned with the US Navy.