Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
공군사령부는 국가의 공중 방어를 책임지고 있습니다.gonggun salyeongbuneun gukga-ui gongjung bang-eoleul chaegimjigo issseubnida.The air force command is responsible for the country's air defense.