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Subclass UG
| UG1-620 | Military engineering | |
| UG160-302 | Tactics and regulations | |
| UG335 | Bridges | |
| UG340 | Tunnels | |
| UG360-390 | Field engineering | |
| UG400-442 | Fortification | |
| UG443-449 | Attack and defense. Siege warfare | |
| UG470-474 | Military surveying, topography, and mapping | |
| UG490 | Land mines, etc. | |
| UG500-565 | Technical troops and other special corps | |
| UG570-582 | Military signaling | |
| UG590-613.5 | Military telegraphy and telephony | |
| UG614-614.5 | Military electric lighting | |
| UUG615-620 | Military motor vehicles | |
| UG622-1435 | Air forces. Air warfare | |
| UG633-635 | By region or country | |
| UG637-639 | Education and training | |
| UG640-645 | Military aeronautical research | |
| UG700-705 | Tactics | |
| UG730-735 | Air defenses | |
| UG760-765 | Aerial reconnaissance | |
| UG770-1045 | Organization. Personnel management | |
| UG1097 | Air bases | |
| UG1100-1435 | Equipment and supplies | |
| UG1500-1530 | Military astronautics. Space warfare. Space surveillance | |
| UG1523-1525 | By region or country | |
