MCRP 12-10B.1, page 283

enemy from infiltrating back into the cleared building. After securing a floor (bottom, middle, or top), selected members of the assault force are assigned to cover potential enemy counterattack routes to the building. Those sentinels alert the assault force and place a heavy volume of fire on enemy forces approaching the building. They should cover: Enemy mouseholes between adjacent buildings Covered routes to the building Underground routes into the basement Approaches over adjoining roofs. As the remainder of the assault force completes search requirements, defensive positions are assigned and tasks are accomplished as established by the priorities of work in the defense. The following actions may then be taken: Resupplying and redistributing ammunition Marking the building to indicate to friendly forces that the building has been cleared Assuming an overwatch mission and supporting an assault on another building Treating and evacuating wounded personnel Further developing a defensive position if the building is to be occupied for any period. Military Operations on Urbanized Terrain C - 11