noun
A rank in the Japan Maritime Self-Defense Force, equivalent to a commander in many navies.
彼は昨年、二等海佐に昇進した。
He was promoted to commander last year.
二等海佐として護衛艦の副長を務めた。
As a commander, he served as the executive officer of a destroyer.
Compound of 二等 (second class) + 海佐 (naval field officer), a rank created for the JMSDF.