NHA TRANG, Vietnam – Rod Kjersten has returned to Vietnam for the first time since he was a nurse i n the U.S. Air Force hospital in Cam Ranh Bay. Now 77, he recalls the precise date when he left – May 28, 1970. He served at the hospital for two years where he treated wounded American soldiers and saw many die. He says while he was initially “gung-ho” about the U.S. and South Vietnamese war efforts, he has since become “neutral.” Asked why, he said it was after seeing the Ku Chi tunnels on this