Nevada Test Site Night Targeting System Navigation Technology Satellite Naval Telecommunications System National Trust for Scotland Network Test System Navigation Technology System Near Term Schedule not to scale NT Server National Topographic System National Traffic System National Training System Navigation Technology Satellites Negative Torque Signal NetWare Telephony Services Network Technical Support Network Transport Services New Testament studies New Trading System Nicotine Transdermal System Non-Traffic Sensitive nucleus tractus solitarius Number Translation Services Numeric Transportation System Cirrus Air nanotubes National Tax Service National Technical Systems National Technology Satellite National Test Site National Testing Service National Topographic Series National Training Survey National Transportation Statistics National Triage Scale NATO Maintenance and Supply Agency Transportation System Naval Test Station Naval Torpedo Station naval training station