Army Tactics, Techniques, and Procedures (ATTP) 3-06.11 establishes doctrine for combined arms operations in urban terrain for the brigade combat team (BCT) and battalion/squadron commanders and staffs, company/troop commanders, small-unit leaders, and individual Soldiers. The continued trend worldwide of urban growth and the shift of populations from rural to urban areas continues to affect Army operations. The urban environment, consisting of complex terrain, dense populations, and integrated infrastructures, is the predominant operational environment in which Army forces currently operate. Each urban environment is unique and differs because of the combinations presented by the enemy, the urban area itself, the major operation of which it may be part (or the focus), and always changing societal and geopolitical considerations. Enemy forces will take advantage of this complex environment by intermingling with the populace. ATTP 3-06.1 1 describes the fundamental principles, tactics, techniques, and procedures (TTP) of urban operations (UO) across full spectrum operations, using the UO operational construct (understand, shape, engage, consolidate, and transition) to outline the discussions. ATTP 3-06.11 is based on current BCT structure and lessons learned from ongoing UO.