Lessons Learned, 31st Engineer Battalion (C) (A) Open PDF Document Details Document Type Technical Report Publication Date Nov 04, 1971 Accession Number AD0907852 Entities Organizations Adjutant General's Corps Tags Communities of Interest Air Platforms DTIC Thesaurus Topics Army Contractors Directives Dump Trucks Engineers Helicopters Infantry Lessons Learned Mechanical Equipment Security Specialists Towed Bodies Towed Vehicles Trailers Training Vehicles