Shackelford, S., Del Junco, D., Powell-Dunford, N., et al. (2017). Association of Prehospital Blood Product Transfusion During Medical Evacuation of Combat Casualties in Afghanistan With Acute and 30-Day Survival. Journal of the American Medical Association. 318(16): 1581–1591.
A retrospective cohort study of U.S. military combat casualties found that prehospital transfusion was linked to improved survival at both 24 hours and 30 days.