Fast Missile Cruiser?

[DentArthurDent]

I was looking through my campaign notes and came across a reference to a “Fast Missile Cruiser.”
Is there such a ship?
If so, can someone tell me what edition it is in, or - even better - in what book I could find it?
I’ve searched every digital Traveller book I own, but no luck.

 

[Condottiere]

I don't know about fast, but the Imperium Navy has bombardment cruisers.

Probably, also missile cruisers.

Grand Fleet.

Sector Fleet being Mongosian.