• 尉官いかん — commissioned officer
• 少尉しょうい — second lieutenant; sub-lieutenant
• 中尉ちゅうい — lieutenant; first lieutenant
• 大尉たいい — captain (army, air force, etc.)

The 寸 element often appears in kanji related to control, authority, or actions done by hand. Here it helps express a rank that carries responsibility and the power to command.