RecruitingPhase 2Drug trialCAlcium and VAsopressin Following Injury Early Resuscitation (CAVALIER) TrialThe CAlcium and VAsopressin following Injury Early Resuscitation (CAVALIER) Trial is a proposed 4 year, double-blind, mutli-center, prehospital and early in hospital phase randomized trial designed to determine the efficacy and safety of prehospital calcium and early in hospital vasopressin in patients at risk of hemorrhagic shock.