when i first started playing i was doing a mission at the star base killing klingons with fellow federation players.
i have since then found the crystiline entity. is there any more of these i like the co op part of the game and would like to do more of it thanks.

The patrol sector missions can be as well as the defend sector missions.

If you're talking about Fleet actions, I believe the Crystaline entity is the last fleet action currently on live, but there are 2 or 3 more coming in the next major update, and all the current fleet actions will be level banded, so you can do, for example, starbase 24 as an RA5 and fight level 45 Klingons.

fleet actions yes thats what i was after thanks for the info!