• 軍隊ぐんたい — military forces
• 軍人ぐんじん — soldier
• 海軍かいぐん — navy
• 空軍くうぐん — air force

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軍 combines 車 (“vehicle”) with 冖 (“cover”). Historically, it represented troops organized and encamped, often with vehicles and supplies. Over time, it came to mean “army” or “military forces” in general.