Prime Minister Itō Hirobumi was allowed to attend meetings by the express order of Emperor Meiji during the First Sino-Japanese War.
The Liaison Conferences were intended to assist in integrating the decisions and needs of the two military sections of Imperial General Headquarters with the resources and policies of the rest of the government.
During the Pacific War, and after the firebombing of Tokyo, the Imperial General Headquarters relocated to an underground facility in the mountains outside Nagano.
In addition, the Inspector-General of Military Training, whose rank was almost on-par with that of the Chiefs of the General Staff, and the Aide-de-camp to the Emperor of Japan were also members.
Middle-ranking officers of Army and Navy General Staff, and Army and Navy Ministry, met from time to time at middle-level liaison or study conferences to discuss Japan's strategic war plans, and especially, plans requiring cooperation between the two armed services, outside of the formal meeting in the presence of the Emperor.
During World War II, the leadership of the Imperial General Headquarters consisting of the following: The majority of these troops were stationed in China, Indochina, Japan, Taiwan, and Korea.