Lessons Learned, Headquarters, 20th Engineer Battalion Open PDF Document Details Document Type Technical Report Publication Date Jul 29, 1969 Accession Number AD0856118 Entities Organizations Adjutant General's Corps Tags Communities of Interest Weapons Technologies DTIC Thesaurus Topics Air Compressors Ammunition Artillery Artillery Fire Artillery Units Civic Action Civil Affairs Civilian Personnel Concrete Construction Engineers Guns Lessons Learned Maintenance Materials Three Dimensional Warfare