This observational study investigates the impact of two CE marked and FDA approved sternal needles in comparison to intravenous access on the flow-rate of autologous reinfusion of whole blood and the possible hemolysis of red cells post-transfusion in a population of healthy military officers. We also investigate the technical success rate of sternal IO Access between two CE marked and FDA approved sternal Devices. As a supplementary investigation we seek to investigate the anatomic changes as shown by Magnetic Resonance Imaging in individuals who have received multiple intraosseous sternal needles With autologous reinfusion of whole blood.