Shock troops or assault troops are formations created to lead an attack. They are often better trained and equipped than other infantry, and expected to take heavy casualties even in successful operations.
shock tactic or
shock attack is the name of an offensive
maneuver which attempts to place the enemy under psychological pressure by a rapid and fully committed advance with the aim of causing their
combatants to retreat. The acceptance of a higher degree of risk in order to attain a decisive result is intrinsic to shock actions.
So to sum up what i'm saying SHOCK infantry is not meant to survive most attacks and are meant to be used to shock and demoralise you're opponent and to cause confusion among'st their troops till the main bulk of you're forces can engage the now weaker and more confused enemy and wreak massive bloody havok