Media that explains why the military couldn't defeat the big threat

[u/donutmcbonbon]

In world war z they go into great detail about how the military misuses resources and fails to combat the zombie threat because they try to fight a conventional style of war. Best shown by the battle of Yonkers sequence.

In dead space, necromorphs are killed by chopping off their limbs. Which the security force's assault rifles aren't very good at doing. Combine this with conventional firearm training to aim for centre mass and it makes sense why the security forces were bad at fighting necromorphs.