• 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 — team leader / squad captain
• 部隊ぶたい — troops / military unit

This kanji is a 形声文字 (semantic-phonetic compound). The left part is 阝 ("hill" or "place") and the right part is 坴 (phonetic component representing ツイ). Originally, it conveyed the idea of people assembled or stationed in one place, often in a military or strategic context.

消防隊しょうぼうたいが 現場げんばに 到着とうちゃくしました。
The fire brigade arrived at the scene.

軍隊ぐんたいは 国くにを守まもるために存在そんざいします。
The military exists to protect the country.

隊長たいちょうは 作戦さくせんを 説明せつめいしました。
The squad leader explained the mission.

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