This is a prospective, observational study. All patients who present to the participating ED's who meet inclusion/exclusion criteria will be identified by the treating trauma surgeons. Data collected will include basic patient demographics, data regarding the patient's injuries, data regarding tourniquet use, and data regarding outcomes. Please see the attached data collection tool for specifics (Appendix 12.1). Data will be collected prospectively in an observational manner using the data collection tool. Data collected on individual collection sheets will be de-identified. We plan to complete the data collection and analysis by 01\01\2021.

