What subjects do the call letters cover?
Subclass V Naval science (General).
Subclass VA Navies: Organization, distribution, naval situation.
Subclass VB Naval administration.
Subclass VC Naval maintenance.
Subclass VD Naval seamen.
Subclass VE Marines.
Subclass VF Naval ordnance.
Subclass VG Minor services of navies.
Subclass VK Navigation. Merchant marine.
Subclass VM Naval architecture. Shipbuilding. Marine engineering.