For those who dont know, fleet ops is a mod for star trek armada 2 which basically hugely improves the graphics, gameplay, balance, tactical merit.... Well, it improves everything. Its a multiplayer only mod (although there is a AI skirmish mode) and if you dont have a copy of armada 2, i guess you could get a torrent, but i don't condone that. Its just that new copies of armada 2 can be expensive
Heres a video showing the borg attacking a starfleet base:
http://www.moddb.com/mods/star-trek-armada-ii-fleet-operations/videos. And getting the online mod to work is a b*tch
the best place to get is to go to their site
http://www.fleetops.net/