軍曹 is read as ぐんそう (gunsou) and means sergeant.
ぐんそう
gunsou
いっとうぐんそう
sergeant first-class
にとうぐんそう
staff sergeant
さんとうぐんそう
sergeant
ぐんたい
armed forces
ぐんこくしゅぎ
militarism
ぐんしゅく
reduction of armaments
ぐんかく
military expansion
ぐんかん
warship
ぐんじゅ
munitions
ぐんぞく
civilian in military employ
ぐんぴょう
military scrip
ぐんじきち
military base