Military manual · MCRP 12-10B.1
MCRP 12-10B.1, page 219
Military Operations on Urbanized Terrain (MOUT)
Marine Corps Reference Publication: Military Operations on Urbanized Terrain (MOUT)
…Should the second cover person have to take the point while the point person
pies a window or door, the third cover person would automatically shift his/her sector
of fire to the 45-degree oblique…