Assuming you know about agents, i'll go into the more recent updates.
To lockdown OPs now, the OP must have at least 24 control ticks. Furthermore, you gain a 1 tick immunity to lockdowns on an OP after it has been taken, but ONLY to lockdowns. You can still get virus'd, for example. Finally, 2 agents of differing alliances can now fight each other on OPs. Whichever agent has the most infiltration points, wins.viewtopic.php?f=171&t=18345
[19:00:21] Alexander: thats my opinion, maybe its *CENSORED*