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Subclass U
| U1-900 | Military science (General) | |
| U21-22.3 | War. Philosophy. Military sociology | |
| U27-43 | History of military science | |
| U45 | Historiography | |
| U56-59 | Army clubs | |
| U150-155 | Military planning | |
| U161-163 | Strategy | |
| U164-167.5 | Tactics | |
| U168 | Logistics | |
| U250-255 | Maneuvers (combined arms) | |
| U260 | Joint operations. Combined operations | |
| U261 | Amphibious warfare | |
| U262 | Commando tactics | |
| U263-264.5 | Atomic warfare. Atomic weapons | |
| U300-305 | Artillery and rifle ranges | |
| U310-310.2 | War games | |
| U320-325 | Physical training of soldiers | |
| U400-714 | Military education and training | |
| U750-773 | Military life, manners and customs, antiquities, etc. | |
| U799-897 | History of arms and armor | |
