My idea is that having an objective where one team has to kill (not just incapacitate) a specific number of the other team to advance to the next objective. This would add a little bit of a different feel to the match as new strategies would be needed as the hunted team must either spread out and hide or stick together and build up defensively. In regards to how such an objective would work in the story of a mission could be as simple as having the last objective force Resistance or Security to kill all of the remaining enemies in the area to either make sure no one survives to either report back or plan another attack...depending on fraction.
Now, of course the only way this would work is if during this objective/phase the safe zone turrets must be deactivated and multiple spawn locations are enabled that players who die can pick from. Just an idea I thought I would share...your thoughts? Also, if you have any ideas for new objectives in the future...feel free to share!