• 隊たい — squad / team
• 軍隊ぐんたい — military / armed forces
• 消防隊しょうぼうたい — fire brigade
• 隊長たいちょう — squad leader / captain
• 部隊ぶたい — troops / unit
• 隊員たいいん — member / trooper

A 形声文字. Left: 阝こざとへん (“place, hill”), Right: 坴りく as the phonetic. The character suggests people stationed in one place — an organized group, such as a military unit or corps.