Make minimum changes to the outside appearance of buildings where positions are located.

Screen or block windows and other openings to keep the enemy from seeing in and tossing hand grenades. This must be done so that the enemy cannot tell which openings the defenders are behind.

Remove combustible material to limit the danger of fire. Fires are dangerous to defenders and create smoke that could conceal attacking troops.

Turn off electricity and gas. Both propane and natural gas are explosive. Natural gas is also poisonous, displaces oxygen, and is not filtered by a protective mask.

Locate positions so as not to establish a pattern. Units should avoid obvious firing locations like towers.

Camouflage positions.

Reinforce positions with all materials available such as mattresses, furniture, and so forth.

Block stairwells and doorways with wire or other material to prevent enemy movement. Create holes between floors and rooms to allow covered and concealed movement within a building.