6-55. Defending units use camouflage and concealment to hide defensive preparations. They limit EMS emissions and protect mission command systems and the integrity of data on those systems. They use terrain to mask emitters so as to reduce the probability of enemy SIGINT and EW detection, and offset emitters from CPs to increase survivability if they are detected. Information operations focus on encouraging the local civilian population to avoid interfering with unit operations in the close, support, and consolidation areas. (See FM 3-90-1 for additional information on the performance of preparation tasks associated with area defense operations.)