| C2S | Command and Control Support |
| C2S | Command and Control Systems |
| C2S2 | Command, Control, and Subordinate Systems |
| C2SA-E | Command and Control Support Activity-Europe |
| C2SPR | Command and Control System Program Review |
| C2T2 | Close Combat Tactical Trainer |
| C2T2 | Commercial Communications Technology Testbed |
| C2V | Command and Control Vehicle |
| C2W | Command and Control Warfare |
| C-2X | Coalition Intelligence Directorate, Counter-intelligence and Human Intelligence Staff Element |
| C3 | Command, Control, and Communications |
| C31 | Command, Control, Communications/Intelligence |
| C3AG | Command, Control, and Communications Advisory Group |
| C3CM | Command, Control, and Communications Countermeasures |
| C3I | Command, Control, Communications, & Intelligence |
| C3I | Command, Control, Communications, and Intelligence |
| C3IC | Coalition Coordination, Communications, and Integration Center |
| C3IEW | Command, Control, Communications, Intelligence, and Electronic Warfare |
| C3M | Command, Control, and Communications Counter-Measures |
| C3MP | Command, Control, and Communications Master Plan |