An in-depth study of HJ Gebiet triangles, shoulder straps and their colours, and ranking systems. This comprehensive handbook is based on official sources and contains the most complete listing of Bann numbers and their locations. At a glance, one can check a number's development and its relationship to a specific triangle. Additionally, the triangles and shoulder straps for all known formations are covered, as well as their organizational development. The book, which is co-authored by Philippe Gillain and Jeff Hammond, is an indispensible aid to HJ collectors and researchers.