When flying the Guristas Arc I noticed that almost all frigates and destroyers are allowed:
This site is restricted to certain ship types. You must use one of the following types of ship:
•Electronic Attack Ship
Except for the Tactical Destroyers, which, because of their versatility, are just the thing to be flown in a pirate arc.
CCPlease: add Tactical Destroyers to allowed ship in the pirat arcs.