Equipment and supplies World War, 1939-1945 45 History 33 Armed Forces 12 Design and construction 12 Equipment 11 Firearms 8 Maintenance and repair 8 Airplanes, Military 7 Military weapons 7 Special forces (Military science) 7 Weapons systems 7 Fighter planes 6 Periodicals 6 Police 5 Uniforms 5 Upgrading 5 Air power 4 Fire extinction 4 History, Military 4 Infantry 4 Microcomputers 4 Pictorial works 4 Sound 4 Special weapons and tactics units 4 Aeronautics 3 Airplanes 3 Dissertations, Academic 3 Ordnance and ordnance stores 3 Pistols 3