company officer; officer below major
Military term for a junior commissioned officer, typically ranks from second lieutenant to captain. In the Japanese context, corresponds to 尉官 (いかん) in the Ground, Maritime, and Air Self-Defense Forces.
彼は尉官として部隊を指揮した。
He commanded the unit as a company officer.
尉官の階級章は、佐官や将官とは異なる。
The rank insignia for company officers differs from those of field and general officers.
Compound of 尉 (い, 'military officer') + 官 (かん, 'official'). The reading いかん is the on'yomi of the characters.