Subject
- United States73
- Civil defense warning systems72
- Federal aid72
- Armed Forces63
- Appropriations and expenditures58
- Administrative agencies56
- Evaluation56
- Federal aid to terrorism prevention52
- Reorganization51
- Grants-in-aid49
- United States. Department of Homeland Security48
- Disasters44
- United States. Federal Emergency Management Agency43
- Politics and government42
- Security measures41
- Federal Civil Defense Act of 195039
- Law enforcement38
- Air defenses37
- Nuclear bomb shelters36
- Evacuation of civilians35