URL：https://upload.wikimedia.org/wikipedia/commons/thumb/5/52/US_Navy_090129-N-4774B-008_Gunner's_Mate_2nd_Class_Nicholas_Brassard_inspects_rounds_for_the_MK-38_25mm_machine_gun_system.jpg/1200px-US_Navy_090129-N-4774B-008_Gunner's_Mate_2nd_Class_Nicholas_Brassard_inspects_rounds_for_the_MK-38_25mm_machine_gun_system.jpg
掲載元：https://ja.wikipedia.org/wiki/25mm口径弾
