Military manual · MCRP 12-10B.1
MCRP 12-10B.1, page 258
Military Operations on Urbanized Terrain (MOUT)
Marine Corps Reference Publication: Military Operations on Urbanized Terrain (MOUT)
…The 25-mm gun is devastating when fired against sandbag bunker
walls. Obliquity has the least effect on the penetration of bunker walls. Bunkers with earth
walls up to 36 inches thick are easily penetrated. At…