Armed Forces 439 Military art and science 165 Defenses 142 Periodicals 113 Military policy 111 Veterans 98 Aeronautics, Military 92 more ... Appropriations and expenditures 90 Military readiness 85 National security 85 History 76 Procurement 76 Military research 63 Research 63 World politics 55 Defense contracts 51 Management 50 Strategy 47 Military education 43 Air power 39 Civil defense 36 Soldiers 36 Supplies and stores 35 Medical care 33 Expenditures, Public 32 Safety measures 30 Weapons systems 30 Foreign relations 29 History, Military 29 Air warfare 28 less ...