group leader; squad leader
Refers to the head of a small organized group, such as a work team, neighborhood association, or historical military squad. Often used in contexts like 町内会 (neighborhood association) or 消防団 (volunteer fire corps).
町内会の組頭を任された。
I was put in charge as the neighborhood association group leader.
消防団では組頭が現場の指揮をとる。
In the volunteer fire corps, the squad leader takes command at the scene.