Most soldiers wore the chin strap unfastened or wrapped around the back of the helmet with the metal ends clipped together. This occurred because in hand-to-hand combat enemy soldiers could attack from behind, reaching over the helmet and pulling from behind. With the chin strap worn, the wearer’s head would be snapped back leaving the throat and stomach exposed to knife stab. Other soldiers feared that the concussion blast of explosions could also break their neck because of the fastened chin strap. Later in the war, the helmet got upgraded with an improved canvas chinstrap which would unlock automatically under pressure.
Second World War M1 helmets were painted with flat olive drab paint, mixed with finely ground cork, that produced a rough, textured, flat finish. Camouflage netting was often attached to the helmet to help break up its outline and conceal the wearer's head. During the Battle of the Bulge and in the Korean War, since white helmet covers were not issued to soldiers for winter conditions, they made their own white camouflage helmet covers from any white cloth available on the battlefield, for instance from shirts or parachute canopies. The extra material of the cover and the netting was tucked between the interior of the shell and the liner.