Trusted Computing Group 
Time-Code Generator 
Teleport Communications Group 
The Columbia Group 
Technical Coordination Group 
Test Call Generation 
Transponder Control Group 
Troop Carrier Group 
Geocentric Coordinate Time 
Ship of the Turkish Republic 
Tactical Communications Group 
Tactical Control Group 
Telecommunications Carrier Group 
Test Control Group 
Threat Coordinating Group 
Time Code Generator 
track control group 
Trusted Computer Group 
Tucson, Cornelia and Gila Bend Railroa… 
Tune-Controlled Gain 
Task Certification Guide 
Tasking and Coordinating Group 
technical coordinating group 
Technology Consortium Group 
Technology Coordination Group 
TEMPEST and COMSEC Group 
Test Call Generator 
Testing Co ordination Group 
Thai Air Cargo 
thoracocardiograph