This historic 1966 Republic of (south) Korea’s Army Taekwon-Do Manual was preserved by Grandmaster Jung Woo-Jin, the CEO and Publisher of TaeKwonDo Times Magazine.
As a young Soldier he was issued this book and used it as a guide to teachwhen deployed to Vietnam during their Civil War. Grandmaster Jung also used it as a tool to teach himself the Chon-Ji set of forms that became known as the Chang Hon Patterns, after the Pen Name of the principle designer General Choi Hong-Hi.
https://unity.dojodesk.co.uk/media/taekwon-do-korean-1966.pdf