MCRP 12-10B.1, page 198

Figure A-44. Positioning To Clear an L-Shaped Hallway d. Shooter Number Two, with his/her weapon covering the dead space, pies as far as possible and moves forward to increase his/her angle of fire further into the dead space. Shooter Number One moves accordingly with Shooter Number Two (Figure A-45). e. Shooter Number Two stops pieing just before he/she reaches the position where he/she cannot cover the dead space. Shooter Number One stops short of the hallway and goes to a kneeling position. Figure A-45. Clearing an L-Shaped Hallway f. Shooter Number One says, “READY!” g. Shooter Number Two then says, “MOVE!” and both shooters move simultaneously to clear the hallway (Figure A-46). Shooter Number Two remains standing, and Shooter Number One remains kneeling as he/she pivots around the corner of the wall into the hallway. Military Operations on Urbanized Terrain A - 37