5-59. The responsibility for conducting reconnaissance operations does not reside solely with specifically organized units. Every unit has an implied mission to report information about the terrain, civilian activities, and friendly and enemy dispositions. This is regardless of a unit’s location or primary function. Troops in contact with an enemy and reconnaissance patrols of maneuver units at all echelons collect information on enemy units and activities. In the support and consolidation areas, reserve maneuver forces, functional and multifunctional support and sustainment elements, other governmental agencies, and multinational forces observe and report civilian, adversary, and enemy activity and significant changes in terrain trafficability. Although all units conduct reconnaissance, those specifically trained in reconnaissance tasks are ground cavalry, aviation attack reconnaissance units, scouts, Ranger units, CA units, and SOF. Some units, such as engineers, CA, and the chemical corps, have specific reconnaissance tasks to perform that complement the force’s overall reconnaissance effort. However, BCT, division, and corps commanders primarily use their organic or attached reconnaissance—ground or air—and intelligence elements to conduct reconnaissance operations.