Lessons Learned, Headquarters, 20th Engineer Battalion (Combat) Open PDF Document Details Document Type Technical Report Publication Date Oct 31, 1968 Accession Number AD0848758 Entities Organizations Adjutant General's Corps Tags Communities of Interest Human Systems Weapons Technologies DTIC Thesaurus Topics Aircrafts Artillery Artillery Fire Concrete Construction Construction Materials Conveyors Engineers Guns Landing Fields Lessons Learned Maintenance Materials Reinforced Concrete Security Small Arms Vehicles