Forecasting -- Foreign relations -- Forecasting 3 National security -- 2 21st century 1 Armed Forces -- 1 Causes 1 more ... Congresses 1 Congresses -- 1 Defences 1 Defense -- 1 Economic conditions -- 1 History, Military -- 1 Military policy 1 Politics and government -- 1 September 11 Terrorist Attacks, 2001 -- 1 less ...