Lessons Learned, Headquarters, 169th Engineer Battalion Open PDF Document Details Document Type Technical Report Publication Date May 09, 1969 Accession Number AD0855561 Entities Organizations Adjutant General's Corps Tags Communities of Interest Human Systems Weapons Technologies DTIC Thesaurus Topics Aircraft Maintenance Aircrafts Army Concrete Construction Contractors Counterintelligence Engineering Engineers Flight Training Lessons Learned Materials Revetments Security Training Warfare Water Purification