Military manual · MCRP 12-10B.1
MCRP 12-10B.1, page 300
Military Operations on Urbanized Terrain (MOUT)
Marine Corps Reference Publication: Military Operations on Urbanized Terrain (MOUT)
…To improve their footing in slippery sewers and storm drains, the squad members may
wrap chicken wire or screen wire around their boots.
d.
A constant concern to units conducting a subterranean patrol is chemical defense…