In the course of his career, he served in the JSDF's Joint Staff Council and was the first commander of the 1st Airborne Brigade before he retired to private life.
Born on February 2, 1915, in Hyōgo Prefecture, he attended the Army's military academy in Narashino in 1936 before graduating in 1941.
In 1971, Hayao was appointed as the 9th Chairman of the Joint Chiefs of Staff[5][6] before retiring to private life in 1973.
In 1985, Hayao was awarded the Order of the Sacred Treasures for his services in the Japanese Self-Defense Forces.
After living years of obscurity in Japanese society, he eventually died on February 11, 2007[2] of heart failure.