Summarize
(C) Personal Letter, dated 24 Oct 67, addressed by Phan Văn Thu, a NVA cadre from a unit stationed in Laos with LBN: 32.253/OK, to a cousin named Hue, reveals that Sender had been operating in Laos for two consecutive years and that he only received letters from NVN once every four or five months. Sender mentioned difficulties with the local population due to the language barrier. He also mentions that his cousin Duong was KIA in Mar 66 and his nephew Hong died while being evacuated to a hospital in NVN.