Lessons Learned, Headquarters, 45th Engineer Group Open PDF Document Details Document Type Technical Report Publication Date Oct 31, 1969 Accession Number AD0865735 Entities Organizations Adjutant General's Corps Tags Communities of Interest Weapons Technologies DTIC Thesaurus Topics Air Defense Aircrafts Army Army Aviation Combat Support Construction Engineers Hospitals Lessons Learned Materials Military Assistance Munitions Schematic Diagrams Schools United States War Colleges Warfare