Maintenance and repair 2,151 Armed Forces 1,475 Equipment and supplies 855 Law and legislation 587 Supplies and stores 414 Equipment 402 Taxation 269 more ... Standards 143 Military trucks 137 Radio 130 Guided missiles 123 Aeronautics 120 Radio, Military 118 Military helicopters 107 Data processing 104 Calibration 103 Airplanes 101 Personnel management 100 Air conditioning 89 Management 89 Safety measures 86 Officials and employees 83 Airports 81 Procurement 73 Tanks (Military science) 72 Refrigeration and refrigerating machinery 70 Transportation 68 Communication systems 66 Public contracts 65 Vehicles, Military 65 less ...