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 - Calvary. Armor.

Subclass UF - Artillery.

Subclass UG - Military engineering. Air forces.

Subclass UH - Other services.

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