Final answer:
The film 'The White Angel' portrays the narrative that nursing is a holy vocation and highlights the professionalism and opposition faced by women in the field during wartime.
Step-by-step explanation:
The film that conveyed to the public that nursing is a holy vocation, nurses have professional credentials, and their career choice is opposed because women belong at home, is 'The White Angel'. During wartime, countless women served as nurses, both on the home front and on the front lines, despite societal expectations that they should remain at home. Their sacrifice and service played a crucial role in medical care during the war. This is documented in various sources including personal diaries, photographs, and essays about the lives and contributions of these courageous women, such as the work of Gerald W.L. Nicholson, 'Canada's Nursing Sisters', and Shawna M. Quinn's 'Agnes Warner and the Nursing Sisters of the Great War'. Furthermore, nurses risked their lives not only serving on the battlefields but also in transporting injured soldiers back home, often under dire circumstances such as the sinking of the hospital ship Llandovery Castle where fourteen nurses perished.