Specific rank in the Japan Ground Self-Defense Force; equivalent to master sergeant in many English-speaking armies.
He was promoted to master sergeant.
The rank insignia for master sergeant has three cherry blossoms.
Standard kanji spelling for this JGSDF rank.
Variant using numeral １; less common but still seen in official contexts.
Compound of 一等 (first class) + 陸曹 (ground sergeant), a modern JGSDF rank term.