WASHINGTON (Reuters) - Two U.S. B-1B bombers flew through South Korean airspace and over the country s Pilsung Range on the latest exercise there on Thursday, Air Force spokeswoman Captain Victoria Hight said, offering additional details about the drill. The Air Force said in a previous statement that the drill took place  in the vicinity of the Korean peninsula,  without providing specific locations. It said Japanese and South Korean fighter jets carried out a sequenced mission with the U.S. bombers. 