Acquired from a Local Army Navy Surplus location that closed its business, these are without packaging and we have no information on their history, but is in excellent condition. 71 Pages.The December 1985 lesson booklet, Writing and Understanding JINTACCS Messages: Voice Messages, identified as TEC Lesson 580-113-6668-A, provides comprehensive training on crafting and interpreting voice messages within tactical command and control systems. Produced by the U.S. Army Signal Center at Fort Gordon, Georgia, this instructional guide emphasizes joint interoperability, with a detailed diagram on the cover showcasing connections among branches and agencies such as the Army, Navy, USMC, USAF, NSA, and DIA. The lesson includes structured materials like student/supervisor instructions, pretests, posttests, and an answer key, offering valuable insights for effective communication in joint operationsThis resource is both practical and historically significant for professionals or enthusiasts in military communications.