Lessons Learned, Headquarters 69th Engineer Battalion Open PDF Document Details Document Type Technical Report Publication Date Nov 12, 1969 Accession Number AD0865143 Entities Organizations Adjutant General's Corps Tags Communities of Interest Human Systems Weapons Technologies DTIC Thesaurus Topics Abstracts Army Artillery Construction Construction Materials Engineers Helicopters Landing Fields Lessons Learned Maintenance Maintenance Personnel Materials Military Assistance Observation Officer Personnel Security Training