U. S. Naval Forces, Vietnam Monthly Historical Summary for April 1968 Open PDF Document Details Document Type Technical Report Publication Date May 07, 1968 Accession Number ADA953626 Tags Communities of Interest Human Systems Weapons Technologies DTIC Thesaurus Topics Aircrafts Automatic Weapons Boats Casualties Diving Equipment Gunfire Helicopters Infantry Psychological Operations Recoilless Rifles Recording Systems Rifles Ships Small Arms Tape Recorders Task Forces Weapons