This game mode is a "domination" type game where the teams have to capture flags that all are set to neutral. Both teams can either defend or attack the enemies or their sectors. Holding the flags accumulate points until one team reaches the set score limit.
Medal of Honor (2010)
There are a total of three flags set around the map. Two are right next to each spawn point for both Python 1 and the Opposing Forces. The third is set an equal distance from both spawn points. The Flags that the team holds set the spawn point for their team.
Players should be very cautious about IEDs and C4 charges, as snipers usually have them set all around Sectors.
Going around the sector and clearing out enemies is good if the player has a high Support Action streak.
Conversely, if one wishes to defend a Sector, it is a good idea to get to a high vantage point, or an area that has a good view.
Staying in the Sector will stop any enemies from taking it. Note, this may cause the player to be killed. Running into a sector that isn't going down means that there is an enemy in the vicinity.
"There are three flags. Take control by occupying the immediate area. Controlled flags will give your team points over time. Control more flags than your enemy."
— Loading Screen Description
Sector Control returns in Warfighter. It is very much similar to the old version. One of the few differences from the 2010 version, though, is that the flag that appears on the flagpole is of the country the soldier that gets to flag first is from.