Weapons systems Armed Forces 31 Periodicals 20 History 14 Military supplies 14 Military art and science 12 Military weapons 9 Equipment and supplies 7 Military policy 5 Arms race 4 Munitions 4 Ordnance, Naval 4 World War, 1939-1945 4 20th century 3 Defenses 3 Nuclear weapons 3 Procurement 3 United States 3 Army 2 Biological weapons 2 Design and construction 2 Developing countries 2 Firearms 2 Forecasts 2 Germany 2 Handbooks, manuals, etc 2 Juvenile literature 2 Management 2 Military 2 Ordnance 2