Due to pressure from the Empire of Japan and the United States, as well as drought affecting their crops, they were forced to close down.

Park Yong-man, who emigrated to the US in February 1905, studied political science at Hastings College in University of Nebraska–Lincoln and joined the Reserve Officers' Training Corps in September 1908.

It was an organization created to spread the need for an anti-Japanese war of independence among the Korean American community by inheriting the spirit of the military movement.

After graduation, they either worked as independent soldiers in Manchuria or Russia or joined the U.S. Army and fought on the European front.

Among these, widely known figures include Kim Yong-seong (Captain of Maeng Ho-gun Battalion, Korean National Guard in Los Angeles), Lee Hee-kyung (First President of the Korean Red Cross and Provisional Deputy Foreign Minister), Jeong Han-kyung (Ambassador of the Permanent Mission to Japan), Kim Hyeon-gu (Chairman of the Hawaiian Regional General Assembly of the National Association), and Yu Il-han ( Yuhan Corporation founder), Koo Young-sook (the first Minister of Health), etc.

[5] In 1912, Park Yong-man, who was appointed editor-in-chief of the San Francisco's 'Shinhan Minbo' and Hawaii's 'Kukminbo' newspaper of the Hawaiian Regional General Assembly of the Korean National Association, worked hard to realize in Hawaii the national duty system and Korean autonomy system that had been advocated in North America as part of the construction of a provisional government.

Park Yong-man wanted to create a military academy composed of 2,000 to 3,000 men to train troops and soldiers who would later fight for independence.

[4] In 1914, when the Japanese Consulate General in San Francisco protested this military training to Hastings College, which provided facilities for the child soldier school, the child soldier school had no choice but to close after six years in the summer of 1914 and due to financial difficulties.

Meanwhile, the Korean National Corps leased and operated a pineapple farm covering 1,500 acres in the Ahui Manu region to achieve financial independence.

[8][4] On June 10, military insignia were issued to over 100 residents who were employed in pineapple farming during the day, and the founding ceremony of the Korean National Corps was held.

On August 29, 1914, after the construction of the barracks was completed, they prepared the inauguration ceremony, a corps had to be organized in a military style.

The rumor that Park Yong-man was planning to establish a military school was picked up by the Japanese consulate intelligence network within a few months of his arrival in Hawaii.

"Judging from Park Yong-man's remarks, it seems that starting military training in Hawaii was not necessarily with the intention of going to the border area of Joseon and waging an armed resistance.

They said that they should use that opportunity to pursue Korea's independence by siding with the United States, and to prepare for it, they should hasten the establishment of the National Army.

A confidential document sent by the Japanese Consulate to the Minister of Foreign Affairs of the country on March 30, 1914 contains the following information:[3] "The composition of the cadets at the military school is diverse.

They were mainly members of the Methodist Church, students who wanted to study, local scholars who learned Chinese classics at a seodang, former Gwangmu soldiers, rural laborers, hard-earned workers, and gangsters who were idle.

There was a rumor going around among compatriots that a thousand people had flocked to the National Corps, $10,000 had been raised, and even a car had already been prepared, making the Japanese consulate recognized its true nature and designated it as a “military school” in the report.

[1] The U.S. Secretary of State requested a strict investigation by the Ministry of the Interior, and the Ministry of the Interior sent an official letter to the Governor of Hawaii, ordering him to investigate whether Park Yong-man and his followers possessed weapons and whether they were involved in or instigated Japan's internal affairs.

[7] In the end, the Hawaii Regional Assembly was deprived of its autonomy as the special police powers approved by the Hawaiian government were revoked.

In particular, when World War I broke out, the international situation became favorable to Japan, which was an allied country based on the Anglo-Japanese Alliance at the time.

[1] In October 1916, the Korean National Corps moved to the coastal area of Kahuku, about 40 km north of Ahuimanu.

As a result, the Korean National Army Corps, which had implemented a dull war system of unity between soldiers and farmers, faced great financial difficulties.

However, because the use of highly lethal firearms was prohibited, military training was conducted using wooden guns, and the operation of the corps was based on the principle of a gun-to-arms system.

[1] The exact location of the Korean National Army Corps and Military Academy site has not been historically researched or confirmed to date.

There are also 53 trumpet tunes played by the military band of the corps, the flag of the Korean National League, and a notebook containing gymnastics commands.