The study will be conducted using an innovative infrastructure and method of participant recruitment and enrollment. Mobile clinics containing the imaging equipment will travel to the three markets included in the study. The mobile clinic configuration allows for a high level of consistency in the data measurements which will be collected from diverse geographic areas and populations. Participants will be recruited based on claims monitoring to pre-determine eligibility. The baseline examinations of the 7,300 participants will occur over a 12-month period. Based on particular findings (Coronary Artery Calcium (CAC) score, Carotid Intima-Media Thickness (IMT), atherosclerotic plaque, Ankle Brachial Index (ABI), and presence of Abdominal Aortic Aneurysm (AAA), approximately 3,000 participants of the 6,000 imaging cohort will be referred for higher resolution imaging modalities to better characterize their arterial disease. This additional imaging will also be conducted at the mobile clinics and occur during the same 12-month period. Participants will be contacted every 6-months throughout the 3-year study to assess cardiovascular events, clinical morbidity and mortality, and to obtain additional blood samples.