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- United States -- Armed Forces -- Operational readiness1
- United States -- Trials, litigation, etc1
- United States. Department of Defense -- Communication systems1
- United States. Department of Defense -- Data processing1
- United States. Dept. of Defense -- Communication systems1
- United States. Federal Communications Commission6
- United States. Navy -- Communication systems1
- Wireless communication systems -- Government policy -- United States1
- Wireless communication systems -- United States2
- Year 2000 date conversion (Computer systems) -- United States1