# Library of Congress Classification/Class U

CLASS U - MILITARY SCIENCE
For military history, see D-F
(Click each subclass for details)
| Subclass U | Military science (General) |
| Subclass UA | Armies: Organization, distribution, military situation |
| Subclass UB | Military administration |
| Subclass UC | Maintenance and transportation |
| Subclass UD | Infantry |
| Subclass UE | Cavalry. Armor |
| Subclass UF | Artillery |
| Subclass UG | Military engineering. Air forces |
| Subclass UH | Other services |
​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 |
| UA10-997 | Armies: Organization, distribution, military situation |
| UA21-885 | By region or country |
| UA910-915 | Mobilization |
| UA920-925 | Plans for attack and defense |
| UA926-929 | Civil defense |
| UA929.5-929.95 | War damage in industry. Industrial defense |
| UA940-945 | Military communication |
| UA950-979 | Routes of travel. Distances |
| UA985-997 | Military geography |
| UB1-900 | Military administration |
| UB160-165 | Records, returns, muster rolls, etc. |
| UB170-175 | Adjutant generals' offices |
| UB180-197 | Civilian personnel departments |
| UB250-271 | Intelligence |
| UB273-274 | Sabotage |
| UB275-277 | Psychological warfare. Propaganda |
| UB320-338 | Enlistment, recruiting, etc. |
| UB340-345 | Compulsory service. Conscription and exemption |
| UB356-369.5 | Provision for veterans |
| UB370-375 | Military pensions, etc. |
| UB380-385 | Soldiers' and sailors' homes |
| UB407-409 | Warrant officers. Noncommissioned officers |
| UB410-415 | Officers |
| UB416-419 | Minorities, women, etc. in armed forces |
| UB420-425 | Furloughs |
| UB440-449.5 | Retired military personnel |
| UC10-780 | Maintenance and transportation |
| UC20-258 | Organization of the service. By region or country |
| UC260-267 | Supplies and stores |
| UC270-360 | Transportation |
| UC400-440 | Barracks. Quarters. Camps |
| UC460-535 | Clothing and equipment |
| UC540-585 | Equipage. Field kits |
| UC600-695 | Horses. Mules. Remount service |
| UC700-780 | Subsistence |
| UD1-495 | Infantry |
| UD157-302 | Tactics. Maneuvers. Drill regulations |
| UD320-325 | Manual of arms |
| UD330-335 | Firing. Military sharpshooting |
| UD340-345 | Bayonet drill |
| UD380-425 | Small arms. Swords, etc. |
| UD450-455 | Mounted infantry |
| UD460-464 | Mountain troops |
| UD470-475 | Ski troops |
| UD480-485 | Airborne troops. Parachute troops |
| UD490-495 | Airmobile operations |
| UE1-500 | Cavalry. Armor Including horse cavalry, armored cavalry, mechanized cavalry |
| UE144-145 | Horse cavalry |
| UE147 | Armored cavalry |
| UE157-302 | Tactics. Maneuvers. Drill regulations |
| UE420-425 | Cavalry sword exercises |
| UE460-475 | Horses |
| UF1-910 | Artillery |
| UF157-302 | Tactics. Maneuvers. Drill regulations |
| UF400-405 | Field artillery |
| UF450-455 | Seacoast artillery |
| UF460-465 | Siege artillery |
| UF470-475 | Howitzer artillery. Mortar batteries |
| UF480-485 | Garrison artillery |
| UF500-515 | Weapons systems |
| UF520-537 | Ordnance and small arms |
| UF540-545 | Arsenals, magazines, armories, etc. |
| UF560-780 | Ordnance material (Ordnance proper) |
| UF820-830 | Ballistics. Velocities and motions of projectiles |
| UF848-856 | Artillery instruments. Fire control, etc. |
| UG1-620 | Military engineering | 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 | 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 | Military astronautics. Space warfare. Space surveillance |
| UG1523-1525 | | By region or country |
| UH20-910 | Other services |
| UH20-25 | Chaplains |
| UH201-515 | Medical and sanitary services |
| UH520-(560) | Care of sick and wounded. Relief societies |
| UH600-629.5 | Military hygiene and sanitation |
| UH700-705 | Public relations. Press. War correspondents |
| UH750-769 | Military social work. Social welfare services |
| UH800-910 | Recreation and information services |