Subject
Transportation Security measures
Terrorism Prevention
31
Rules and practice
28
Railroads Security measures
15
Evaluation
9
Local transit Security measures
9
National security
7
Transportation Effect of terrorism on
7
Airline passenger security screening
6
Auditing
6
Bus lines Security measures
6
Intergovernmental cooperation
5
National security Law and legislation
5
Shipping Security measures
5
Appropriations and expenditures
4
Cyberterrorism Prevention
4
Transportation and state
4
Aeronautics, Commercial Security measures
3
Airports Security measures
3
Grants-in-aid Law and legislation
3
Infrastructure (Economics) Security measures
3
National security Planning
3
Planning
3
Shipping
3
Terrorism Risk assessment
3
Aeronautics Security measures
2
Aeronautics, Commercial Law and legislation
2
Airline passenger security screening Law and legislation
2
Bridges Security measures
2
Commercial products
2
Computer networks Security measures
2
Container terminals
2
Freight and freightage
2
Harbors Security measures
2
Interagency coordination
2
International trade
2
Management
2
Operational readiness
2
Pipelines Security measures
2
Security measures
2
Terrorism risk communication
2
Tunnels Security measures
2
United States Commerce
2
Aeronautics, Commercial Passenger traffic
1
Airlines Security measures
1
Airports Safety measures
1
Border patrols
1
Buses Security measures
1
Business logistics Automation
1
COVID-19 Pandemic, 2020-
1
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