National security -- 4 Security clearances -- 4 Emigration and immigration 3 Territorial waters -- 3 Foreign relations -- 2 Government publications -- 2 Internal security -- 2 more ... Terrorism -- 2 Crisis management -- 1 Economic conditions 1 Emigration and immigrtion 1 Internal security- -- 1 International security -- 1 Military policy 1 Politics and govenrment 1 Politics and government 1 September 11 Terrorist Attacks, 2001 1 Territorial water -- 1 Terrorism 1 less ...