| USSID | United States Side Impact Dummy 
| Others |
| USSID | United States Signal Intelligence Directive
| Others |
| USSID | United States Signals Intelligence Directive
| Others |
| USSID | United States Signals Intelligence Directives
| Others |
| USSID | United States Signals Intelligence Directorate
| Others |
| USSID | United States Special Intelligence Directive
| Others |
| USSID | United States Special Intelligence Directorate
| Others |