Nagumo was born in Yonezawa, Yamagata Prefecture. In 1989, he graduated from the National Defense Academy and joined the Air Self-Defense Force.[1] After joining the Air Self-Defense Force, he served as an F-15 fighter pilot and was responsible for airspace anti-airspace incursion measures.[2]
On August 25, 2020, he was promoted to the rank of General and appointed Commander of the Western Air Defense Force.[3]
March 30, 2023, he was appointed the Deputy Chief of Staff, Joint Staff.[4]
On February 15, 2024, the Chief of Staff, Joint Staff Yoshihide Yoshida was hospitalized due to overwork, so Nagumo took over his position.[5]
At a cabinet meeting held on March 11, 2025, it was decided to appoint Nagumo as the first commander of the Joint Operations Command, effective March 24.[6][7]