ever heard of the quote, "MEEDDIICCC!!!". WWI is a sea of dying, wounded, or dead people. Medics are needed on the field to revive and store the few they can get their hands on. HOW DO YOU NOT NEED MEDICS IN A PLACE OF WAR?!?! haha
Nurses do not necessarily have to tie into a hospital or even then, they could show the process of pre and post war of all those fallen soldiers