RecruitingProcedureOccupational Cancer Screening in Firefighters: A Pilot Study Within the Inova Health SystemThe purpose of this study is to further understand the clinical impact and follow-up steps that may be required based on using whole-body Magnetic Resonance Imaging (MRI) or whole-body ultrasound and blood tests to detect multiple cancers in firefighters. This study involves an investigational test (cancer blood test) that has not been approved by the U.S. Food and Drug Administration (FDA). Whole-body MRI and whole-body ultrasound are approved by the U.S. Food and Drug Administration (FDA) to be used in the diagnosis of some cancers and is approved for adults and children who present other signs of potential disease. In this study, however, the whole-body MRI and the whole-body ultrasound are considered investigational devices because they are not yet approved for use in healthy adults with no other cancer indications.