U Defensive and Preservative Arts
U10 Military Biography
UA Battles
UC Military Organization
UCA Military Art
UE Military Law
UF The Service
UM Materials, Munitions, Arsenals (local list)
UN Naval History, Navigation, Shipbuilding
UN 10 Naval Biography
UR Naval Law
US The Service
UT Equipment
UV Lighthouses
UW Life-Sawwing serwwice
UX Shipwrecks
C957 | U | Cryptology
IN61 | U | Intelligence
M644 | U | Military
M662 | U | Memes, Mimetic, Mimetic Warfare
P965 | U | Propaganda
SE446 | U | Security Engineering
SE438 | Un | Sea
Cryptology
Intelligence
Artificial Intelligence