Lessons Learned, Headquarters, 93rd Engineer Battalion Open PDF Document Details Document Type Technical Report Publication Date May 15, 1969 Accession Number AD0855273 Entities Organizations Adjutant General's Corps Tags Communities of Interest Human Systems DTIC Thesaurus Topics Air Traffic Army Concrete Construction Containers Distributors Dump Trucks Engineers Flight Training Lessons Learned Materials Membranes Observation Security Test And Evaluation United States Water Tanks