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The 1st Helicopter Brigade was first established on March 20, 1959 by the Japan Ground Self-Defense Force Aviation School in the JGSDF Camp Kasumigaura in Kasumigaura, Ibaraki.
For the next eight years Tohei, in addition to his teaching at the headquarters, was also an instructor at Asia University, Akita Economics University (now North Asia University), Keio University, Nihon Women's University, the Japan Ground Self-Defense Force, and the Japan Maritime Self-Defense Force.
He attended the National Defense Academy of Japan, graduating in 1976 into the Ground Self-Defense Force.
Prior to becoming a manga artist, he served 5 years in the 1st Airborne Brigade of the Japan Ground Self-Defense Force.
The series features the efforts of the Japan Ground Self-Defense Force, Japan Coast Guard, Tokyo Fire Department and Tokyo Disaster Medical Assistance Team in assisting recovery efforts after the initial earthquake and its recurring aftershocks.
He a retired Japan Ground Self-Defense Force Colonel.