Nurses' roles have expanded to support research and development in their fields. It was at this time that doctors and nurses, through experience, also demonstrated that blood could be stored and then transferred safely. from patient to patient, saving the lives of countless soldiers. Some of the progress made had a direct effect on those at home, particularly children and mothers. Inspection of refugees and conscripts revealed poor health habits that led to advances in improving health nutrition and controlling conditions such as scabies. The role of nurses also became more critical during wartime. On July 4, 1943, nurses were also required to undergo special military training. This included not only additional training in health psychiatry and anesthesia, but also physical conditioning to develop endurance. They also reviewed training on how to set up field medical services.