National Training Center 
Negative Temperature Coefficient 
Naval Training Center 
NASA Teleconferencing Center 
National Telecommunications Commission 
National Teleregistration Center 
Noshiro Testing Center 
National Technical Coordinators 
National Telecoms Corporation 
Naval Telecommunications Command 
Navy Training Center 
Non-Temperature Controlled 
Gibson Aviation 
National Targeting Center 
National Tasking Center 
National Telecommunications Conference 
National Telemetering Conference 
National Telemetry Conference 
National Television Center 
National Territorial Command 
National Tick Collection 
National Tracing Center 
National Trade Center 
National Training Centre 
National Transformers Committee 
National Translation Center 
National Translations Center 
National Transmittal Center 
National Transport Commission 
National Transportation Center