Mathematical models 275 Armed Forces 141 Data processing 106 Research 82 Costs 66 Military policy 64 Health insurance 63 more ... Politics and government 54 Foreign relations 52 Medical care 51 Evaluation 48 Personnel management 47 Airplanes, Military 46 Rates 45 Maintenance and repair 44 Weapons systems 44 Economic aspects 43 Procurement 43 Cable television 42 Management 41 Education 39 Law and legislation 38 Recruiting, enlistment, etc 38 Health surveys 37 International relations 37 Electric utilities 36 Climatology 33 Utilization 32 Finance 31 Employment 29 less ...