Lessons Learned, Headquarters, 20th Engineer Battalion Open PDF Document Details Document Type Technical Report Publication Date Oct 03, 1969 Accession Number AD0860344 Entities Organizations Adjutant General's Corps Tags Communities of Interest Human Systems Weapons Technologies DTIC Thesaurus Topics Abstracts Aircrafts Army Artillery Civic Action Concrete Construction Earth Fills Engineers Landing Fields Lessons Learned Maintenance Materials Security Soil Stabilization United States Warfare