Combat causes casualties. Infantrymen know this all too well. A fact of life in combat is the possibility of getting wounded or killed.
Herald was one of the first with a Dead guy. He is a soldier in 1950s kit with SLR rifle in hand. His free arm is raised and he is bent backwards. The intent it to make him look as if he had just caught a bullet.
Realism or a useless addition? The Dead guy is for diorama makers. Those playing with plastic or metal Army men have no real place for him.