Maybe it´s more of a theory vs. practice thing in wartime conditions. I at least found this excerpt very interesting, if not revealing.
Infantry Combat Medics in Europe, 1944–45 (Tracy Shilcutt)
Chapter 3, Combat Reality
Doc, as his unit called him, pressed into the earth as he crawled toward a wounded rifleman. German bullets slashed overhead in the darkening battleground and when he finally reached his buddy he knew he would have to work blindly as snipers fired at any light. His initial assessment indicated that he was dealing with a chest wound. So without benefit of sight, Private T. William Bossidy thrust grimy hands inside his comrade’s shirt, following the sticky trail of welling blood to the torn cavity. He could do no more than sprinkle sulfa powder in the wound and staunch the flow of blood before moving on to help other casualties. Doc Bossidy had in fact no education in the medical arts; his journey to the front as a replacement aid man for the 2d Division reflects the often disjointed yet pragmatic ways in which the Army cared for its combat wounded. His schooling in the mysteries of Spam and eggs at Camp Pickett provided absurd preparation for the lifesaving duties facing him as a company aid man.
As the struggle for Europe intensified, the flood of casualties demanded additional front line medical personnel. In response, the Army pulled Bossidy and others like him from kitchens and typewriters, tasking them first with litter bearer’s work. But as the American forces pushed toward the Siegfried Line attrition among company aid men forced the erstwhile cooks and clerks to move beyond transporting the wounded to treating their injured and dying comrades. Following cursory field explanations of bandaging and morphine injections, Bossidy donned the brassards of a front line company aid man. As an initial caregiver, his new duties seemed deceptively simplistic: control bleeding, minimize shock, manage pain. But as he tended to his fellow soldiers he realized how external forces profoundly complicated his seemingly straightforward job. Bossidy’s story, while distinctive in its details, reflects in its whole the chaotic world of each company aid man as he confronted his own unique circumstances. As the first medical contact for the wounded, aid men worked independently of the BAS medical soldiers, traveling with and living among the infantry platoons. Whether trained in the United States or, as in Bossidy’s case, simply initiated on the field, company aid men in European campaigns learned that Army doctrine and training scarcely prepared them for the horrific realities of war. Successful medics rapidly adapted to combat conditions, insuring their own survival as well as that of their comrades. Learning on the go and under fire, they abandoned or radically modified prescribed medical techniques, discovered ways to utilize the changing terrains for their own protection and for the safety of the wounded, and coped with unanticipated long-term problems. Endowed with a spirit of pragmatism, Doc Bossidy, and the thousands of “Docs” like him, performed their crucial role in the crusade to liberate Europe despite the inadequate, or even absent, training.